Without genetic variation, some of the basic mechanisms of evolutionary change cannot operate. Consider the three primary sources of genetic variation.
1. mutations
2. gene flow
3. sexual reproduction
Review the diagram involving meiosis and fertilization. In all three scenarios, other than the principles governing meiosis, what is the source of genetic variation?
A)mutation
B) gene flow
C) nondisjunction
D) random assortment
Answers
Answer: gene flow
Explanation: seen it on socratic
Related Questions
Which type of fuel creates the most pollution?
A
Wind
B
Nuclear
с
Biomass
D
Coal
Answers
Answer:
D
Explanation:
Answer:
C
Explanation:
Hope this helps
27. In 1986, a meltdown of a nuclear reactor in the city of Chernobyl, in Ukraine, released highly radioactive chemicals into the atmosphere. As a result, people suffered various forms of cancer because of exposure to these radioactive chemicals. Cancerous cells divide much more often than noncancerous cells and form tumors in the body.
(A) The radioactive chemicals burned people’s skin, which increased cell division rates in the people who developed cancer.
(B)The radioactive chemicals polluted people’s food, which changed some people’s ability to digest proteins and caused cancer.
(C) The radioactive chemicals caused structural changes in people’s genes, which changed how proteins functioned in cell division.
(D) The radioactive chemicals polluted people’s drinking water, which caused cells to divide more quickly in the people’s bodies and form tumors.
Answers
Answer:
I believe the answer could be B
This cell part contains an eukaryotic cell's DNA. *
O Endoplasmic Reticulum
O Ribosomes
O Golgi Apparatus
O Nucleus
Answers
9. What is the function of nucleic acids? *
a) store genetic information
b)store energy (long-term)
Oc)store energy (short-term)
O d)build skin, hair, nails, muscles
Answers
Answer:
a option
Explanation:
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Which of the following organelles would not be present in the nerve cell of the humpback whale?
A. Plasma membrane
B. Cell wall
C. Mitochondria
D. Lysosome
Answers
Answer: b
Explanation:
Giving BRIANLIEST PLZ HELP AND ANSWER ASAP!
Answers
I believe that the answer is Pulley #1
Explanation:
Have a nice day :D
Evolution is change in a population over time and includes the gene pools of that population. How does biogeographic
isolation allow for the change of gene pools over time?
O Biogeographic isolation affects the random changes that take place within gene pools.
O Biogeographic isolation causes changes in gene pools that result from populations being separated.
O Biogeographic isolation determines who will win competition for mates
O Biogeographic isolation determines the time that populations will breed
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Answers
In the compound microscope, If you see bacteria move to the right,
this bacteria on the slide, really move to:
O a. Left
b. Downward
on
c. Upward
O d. Right
Clear my choice
Answers
Answer:
a
Explanation:
In a compound microscope, if a bacterium moves to the right, the bacterium on the slide, in reality, moved to the left.
This is because the optical system of the compound microscope is designed in such a way that the lenses change the orientation of the image of objects when viewed.
The system of two lenses - the objective and the eyepiece - produce inverted images of objects on slides. Hence, when an object on the slide under the compound microscope moves to the right, it is seen as moving to the left to the viewer and when it moves up, it is seen as moving down by the viewer.
The correct option is, therefore, a.
hi guys I need help with those questions can somebody help me please am doing a science fair project
the problem is CAN PLANTS STOP SOIL EROSION?
what can we put a title for this problem
what is the hypothesis for this problem
please help
Answers
Answer:Name for project.SOIL SAVERS. plants can stop soil erosion because the roots in plants keep the soil intack. this has already proven true by scientists and farmers. planting plants that has a large root system keeps more soil in. planting carrots and potatoes does not help keep the soil still because they have small root system.
Organisms that have very different taxonomies (e.g. are from different families) but look very similar represent an example of
Answers
PLEASE HELP IN ONE MINUTE WILL MARK BRAINLIST
Answers
Answer:
The answer for this is density.
Explanation:
Hope this helps you <3
More the 90% of the worlds ocean is
Answers
Answer:
Inhabited by life
Explanation:
(GIVING BRAINLIEST AND EXTRA POINTS!!)
Edwin wrote the following notes about static electricity. When an uncharged object is placed close to a charged object, the objects can attract or repel each other. When two electrically charged objects are placed next to one another, the objects can also attract or repel. What statement will correct the error in Edwin's notes?
A) An electrically charged object needs to touch an uncharged object before they attract or repel.
B) When an electrically charged object comes close to an uncharged object, it will attract it.
C) If an electrically charged object is near an uncharged object, it will repel it.
D) When two electrically charged objects are placed close together, they only attract.
Answers
Answer:
it's An uncharged object.
if its not charged the electrically wont go on it
Explanation:
The statement that will correct the error in Edwin's notes is as follows:
An electrically charged object needs to touch an uncharged object before they attract or repel.Thus, the correct option is A.
How do electrically charged objects produce attraction?The electrically charged objects produce attraction of oppositely charged objects. For example, if a positively charged object and a negatively charged object bring close to each other, they interact with one another. Their forces act in the same direction. i.e. from the positive to the negative charge.
There is an interaction between two oppositely charged objects required in order to furnish attraction, while there is an interaction between two identical charged objects required in order to furnish repulsion.
Whether it is attraction or repulsion, it must be required that an electrically charged object needs to touch an uncharged object.
Therefore, the correct option for this question is A.
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What major factors play a role in global warming?
Answers
Answer:
1. Carbon dioxide levels in the Earth's atmosphere have been steadily increasing.
Explanation:
In humans what happens when the breathing rate increases
2 points
1) Additional oxygen will diffuse into the blood as
carbon dioxide diffuses out of the blood in the
lungs.
2) Additional carbon dioxide will diffuse into the
blood as oxygen diffuses out of the blood in the
lungs.
3) Oxygen from body cells will diffuse more rapidly
into red blood cells.
4) Increased oxygen dissolved in the blood will
stimulate the cerebrum to slow the breathing rate.
1
2
3
4
Answers
Answer:
As your level of activity increases, your breathing rate increases to bring more air (oxygen) into your lungs so that your lungs can pump more oxygen into your blood and out to your muscles.
Answer:
B.
Explanation:
The answer is B. :)
Did the assignment and got it right!
Mad cow disease is caused by deformed proteins called prions. The disease is spread when meat from an infected cow is eaten. Prions can cause normal proteins to become deformed, producing more prions. After a few years, the brain of an infected person or cow looks like a sponge full of holes. Are prions considered organisms?
Group of answer choices
Yes, because they can cause disease
No, because they can’t make their own food
No, because they are not made of cells
Yes, because they can make more of themselves
Answers
Answer:
D - Yes, because they can make more of themselves
Explanation:
A simple search online told me that they were organisms.
What distinguishes science from other disciplines that do not use scientific methods?
O Science relies on observation, measurement, and experimentation.
O Science relies on fixed experimental results that cannot be changed over time.
O Science can answer all questions about the natural world through experimentation
O Science relies on anecdotal evidence that may or may not be measured and verified.
Answers
Answer:
Science relies on observation, measurement, and experimentation.
Explanation:
If science is not understood exclusively as a system of knowledge, but also as
a kind of human activity aimed at acquiring new knowledge about reality - the question of the method by which such activity is performed arises.
In order to be properly defined, science must point to the method it uses and its features - criticality.
Which of the following is not a way that the environment can influence traits?
the presence of toxins in the environment
through epigenetic factors
expression of the dominant trait
through variation in temperature
Answers
Answer:
The correct answer is - expression of the dominant trait
Explanation:
The ineraction of the genes such as dominant and recessive trait are incorporated in the genes and not influence by the environmental condition. These interaction are by the de noo mutations or due to the error in gene expression.
The environmental conditions like toxins cause alteration or mutation in the gene expressions. Temeprature or epigentic conditions are also the factor the can cause influence to traits.
Meiosis reduces chromosome number and rearranges genetic information. Explain how reduction and rearrangement are accomplished in meiosis. Include at least 3 ways this happens.
Answers
Answer:
Following are the solution to the given question:
Explanation:
Reduction: Throughout Meiosis I, in mitosis, two pairs pair and separate and transfer towards opposites throughout prometaphase I. Before Metaphase ii they separate the chromosomes during Metaphase II. There's also no gene replication between meiotic division I and meiosis II, and the resultant genomes have lower genetic data (chromatids) than parent organisms.
Through meiosis, genomes are formed in homologous pairs, in mitosis I and II. The spontaneous arrangement of helices with both the plate is the dependent result. During prometaphase I and II, the genomes divide so each gamete earns one of every chromos form. In Interphase I, tetrad interaction occurs throughout chiasma, contributing to genetic diversity.
Having freckles is a dominant trait, and not having freckles is a recessive trait. Which set of parents will not have any children with freckles? A. A mother with FF and a father with ff O B. A mother with Ffand a father with Ff O c. A mother with ff and a father with ff
Answers
As freckles are a dominant trait, they will not occur in the children with a homozygous recessive trait, i.e., ff. The correct option is C.
What are recessive traits?Recessive trait is a trait that really should be transmitted by both parents in order to be present in the offspring. Recessive features might exist in a person's DNA but not manifest in that individual.
As in the given case, F denotes dominance, and f denotes recessive character. Dominant trait always superimpose over the recessive one.
So, as freckles are a dominant trait, they will not occur in the children with a homozygous recessive trait i.e., ff.
Thus, the correct option is C.
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Answer:
c
Explanation:
The total number of genes in the human genome is___?
Answers
Answer:
thirty thousand (30,000)
Explanation:
estimated 30,000 Gene's in the the human genome
NEED HELP ASAP WILL GIVE BRAINLIST
Answers
Forest butterflies are often brown. This helps them to
Answers
Answer:
Avoid predators
Explanation:
Organisms often mimic their surroundings to escape the predators. This technique is also called camouflaging.
Forest butterflies have also adopted several structural adaptations to avoid predators. Many of them have brown wings with jagged edges so that they resemble dried leaves. In this way, they blend with their surroundings, especially the forest floor, and go unnoticed. On the other hand, butterfly larvae are green in color so that they resemble the leaves on which they feed and avoid predators.
If a female fruit fly is heterozygous with the allele for white eyes being recessive and the red eyes being dominant on the X-chromosome. She is crossed with a hemizygous red eyed male, what would be the expected ratio of male and female phenotypes if they were bred together?
Answers
Answer:
100% red eyes because there is 50% AA and 50% Aa.
Explanation:
To find the expected ratio of male and female phenotypes if they were bred together, you need to make a punnett square/table.
Female: A a
"A" is white eyes, which is RARE. "a" is red eyes, which is COMMON.
Male: A A
"A" is red eyes, which is COMMON.
Multiply Aa x AA by a punnett square.
GUIDE:
1. AA is common and does not carry the recessive gene of being white-eyed. 2. aa is rare and carries the recessive gene of being white-eyed.
3. Aa is common as being red-eyed since being red-eyed is dominant, but carries the recessive gene of being white-eyed.
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Answers
It will increase genetic diversity in gametes, so option A would be correct I believe !
white eyes are recessive in flies. can two red eyed flies have white eyed offspring
Answers
Answer:
Considering that white eyes are a recessive trait in flies, it is possible for two red-eyed flies to have offspring with white eyes only if both are heterozygous for this trait.
Explanation:
For two individuals with dominant phenotype for a trait to have offspring with the recessive trait, both must have a heterozygous genotype.
In the case of the characteristic eye color of the flies :
Red eye (R) is dominant trait. White eyes (r) is the recessive trait.When both parents are heterozygous, their genotype is Rr
In Punnett Square it can see the result of the crossing of these individuals:
Punnett Square :
Rr X Rr
Alleles R r
R RR Rr
r Rr rr
In the offspring, the probabilities are:
50% heterozygous individuals Rr, with red eye phenotype. 25% pure dominant individuals RR, with red eyes 25% individuals with the recessive rr genotype, white eyes.This is the possibility of two red-eyed flies having white-eyed offspring.
The bacterial RecA protein (and its counterpart in eukaryotes, Rad51) are involved in, and help direct: ________.
a. chromatin packing and heterochromatin formation
b. Apurinic site repair
c. Post-transcriptional regulation
d. Strand invasion
Answers
Answer:
The appropriate alternative is Option b (Apurinic site repair).
Explanation:
Although these antibodies eliminate compromised DNA bases through midriff of N-glycosylic attachments, maintaining perhaps an apurine or perhaps even apyrimidine site today.RecA connects towards DNA damage as well as precipitates recombinant restoration through doulas branch fracture pairing or daughter strand difference restore.Other solutions aren't relevant to the situation in question. So that the answer above is the right one.
What is one way that science helps shape society?
Answers
In a solution, solute substances naturally tend to move from areas of higher concentration to areas of lower
concentration.
What is the name of this process?
diffusion
passive transport
O equilibrium
osmosis
Answers
Answer:
The process is diffusion
Explanation:
Molecules or substances in solution move by various means. In osmosis, and passive diffusion, water or other substances move across a barrier or membrane.
In diffusion, molecules of a substance, like the solute (dissolved in a solvent) move from regions of high concentration down their concentration gradient, to a region of low concentration.
Answer:
can you explain your question better, thanks buddy ill answer you in the comments .
Explanation:
The cell shown above most likely belongs to an organism of the kingdom ?
A - animalia
B - Plantae
C - Fungi
D - Eubacteria