Because meiosis creates cells that are destined to become gametes (or reproductive cells), this reduction in chromosome number is critical — without it, the union of two gametes during fertilization would result in offspring with twice the normal number of chromosomes!
Why is the population of different deciduous tree species limited during winter time?
Answer:
Because trees don't produce food during the winter, they don't have the energy that it takes to maintain their leaves. ... This chemical triggers the tree to shed its leaves and to halt all growth to save energy.
Explanation:
Evidence exists that during the millions of years in which the Grand Canyon formed, the canyon divided a single population of tufted-eared squirrels into two populations. One of these squirrel populations, the Kaibab squirrel, now lives in isolation from the other tufted-ear squirrels on the North Rim of the canyon. The other population, the Abert's squirrel lives on the South Rim. Some biologists think that the two populations of squirrels have evolved into two separate species. Other biologists think that the Kaibab squirrel is a subspecies of the Abert's squirrel.
Answer:
A few of the squirrels manage to cross the canyon and breed with the squirrels on the other side.
Explanation:
The formation of the canyon divide the population of the tufted ear squirrels into two different population or species of the squirrels. One is the Kaibab squirrel which lives in the north Rim of the canyon while the other is the Albert's squirrel that lived in the South Rim.
The Kaibab squirrel has a black belly, white tails and tufted ears while the features of the Albert's squirrel is that it has white belly, white tail and tufted ears.
Now the factors that could make the evolution or the formation of the squirrel population in two different species less likely is the few of the squirrels might have crossed the Grand Canyon and moved to the other part and breeded with the squirrels there. So both the species have somewhat similar features.
in prophase 1 of meiosis, crossing over results in
Answer:
Crossing over results in Genetic Recombination.
Explanation:
Which is a valid claim about how meiosis I differs from meiosis II?
Answer:
Homologous pairs of cells are present in meiosis I and separate into chromosomes before meiosis II. In meiosis II, these chromosomes are further separated into sister chromatids. Meiosis I includes crossing over or recombination of genetic material between chromosome pairs, while meiosis II does not.
Explanation:
Hope this helps pls mark brainliest!!!
Explain why tongue rolling ability is a discontinuous variation
Since tongue rolling ability is determined by a single gene with two separate alleles—the dominant allele, which codes for tongue rolling ability, and the recessive allele, which codes for tongue rolling incapacity—tongue rolling ability is a discontinuous variation.
What is Tongue rolling ability?The hereditary characteristic known as tongue rolling ability controls whether or not a person can roll their tongue into a tube shape. This characteristic is frequently used as an illustration of a straightforward hereditary trait with discontinuous variation since there are only two possible outcomes: either a person rolls their tongue or they do not.
Either a person has the recessive allele, which prevents them from rolling their tongue, or they have the dominant allele, which allows them to roll their tongue. There is no intermediate or in-between trait, and the presence or absence of the dominant allele is a distinct, plainly observable phenotype.
Therefore, the capacity for tongue rolling is an illustration of a discontinuous variation.
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When a crocodile has birds in its mouth, what symbolic relationship does it represent?
Answer:
The symbiotic relationship between the crocodile and the plover bird is exemplary of two organisms working together. The plover bird flies inside the crocodile's mouth, which may seem dangerous for the bird and food for the crocodile
Explanation:
What part of the endocrine system is most likely being affected?
Answer:
i think its
Pituitary Gland<
Explanation:
The endocrine system is the collection of glands that produce hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood, among other things.
A(n) what is a chemical produced by one animal to influence the
behavior of another animal of the same species?
Explanation:
The answer is ( faramones). for mating purposes..
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Who finally provided enough evidence for the theory of plate tectonics to be widely accepted, and where was this evidence found?
Answer:
Alfred wegener was the one that provided the evidence for plate tectonics
Answer:
Alfred Wegener
Explanation:
German meteorologist Alfred Wegener is often credited as the first to develop a theory of plate tectonics, in the form of continental drift.
Please help!! Giving 15 pointsto best answer!!. What is the purpose of cell division?
A. Growth of new cells
B. Replacement of older, worn out cells
C. Used for reproduction
D. All of the above
Answer:
D
Explanation:
I'm sorry for that other answers I hate when people do that good luck! :)
What are some warming behaviors an animal might perform to warm its body temperature up?
Which of the following is NOT a primary mineral?
A. Mica
B. Feldspar
C. Quartz
D. Limestone
Answer:
D
Explanation:
limestone isn't a primary mineral
How many chromosomes foes the nucleus of sperm cell contain?
Answer:
23 chromosomes
Explanation:
All normal cells have 46 chromosomes but sperm have half that number or, 23. If and when the sperm joins ups with the female's, egg (ovum) which also has 23 chromosomes, together they add up to 46 chromosomes.
Why don’t rivers run straight?
Answer:
Rivers don't run straight because water flows in the least path of resistance
Explanation:
It is small disturbances in topography that set off reactions that alter the path of a river Any kind of weakening of the sediment on one side of a river due to animal activity it could also be because of soil erosion, or human activity can draw the motion of the water towards that side.
Based on the cladogram shown in the
image, which group has a common
trait that all the other groups share?
Answer: I put Mammals, The victim was not stubbed.
Explanation: im not really sure about but the final answer for the presentation/assignment is "Professor Astro used a cougar attack in the kitchen"
PLEASE HELP I DIDN'T STUDY
Answer:
The PH at which an enzyme will function best is;
In the optimal range
Explanation:
Every enzyme has an optimal pH value which is specific for the enzyme, and where their maximum activity of the enzyme is observed, which is known as its optimal pH
When the enzyme is placed in a different pH, the enzyme activity is observed to be diminishing until the effect of the enzyme stops
This is so because, as the pH of the environment changes, the shape of the active site on the substrate to which the enzyme binds to have an effect changes and the enzyme is no longer able to effectively interact with the substrate
The enzymes in the stomach work best in the acidic environment of the stomach and have an optimal pH of 2, while the enzymes of the small intestine have an optimal pH of 7.5
what happens with abnormal cells in our body
Answer: Cells become abnormal if their DNA which carries the instructions they need becomes damaged.
Explanation:
i took the test
PLEASE HELP
Why is life dynamic? (This is the question for my science thesis and I'm stuck) the chapter was on: fossils, age of rocks/fossils, evolution, classification of organisms, 6 kingdoms of organisms, and dichotomous keys....
Answer:
life is dynamic because without life we can not do anything .we will be like non living things.by the life we are able to move here and there .
Since sun can filter to the bottom of a pond because it is shallower than a lake, what would you find at the bottom of a pond that you won't find at the bottom of a lake? A. Rocks B. Fish C. Plants D.Mud
Answer:
The correct answer is - C. Plants.
Explanation:
As we know and also given that the pond is usually smaller and shallower than a lake. Due to this reason, ponds have plants growing on the bottom of them from one side to the other as they get enough light as there is only the photic zone in ponds.
In lakes, there are various zones present and the lakes are deep and big to the ponds and the bottom of the lakes did not get sunlight. Plants require sunlight to grow and lakes are usually too deep to get the sunlight for plants to grow on the bottom.
Describe the borders of Israel after the 1948 War?
Answer:
Israel borders Egypt, Jordan, Lebanon, Syria, and the Palestinian territories of West Bank and the Gaza Strip; it shares maritime borders with Cyprus.
Explanation:
yayy boom
Section 10.3
How does a cell control the process of cell division?
In cell division, the cell that is dividing is called the "parent" cell. Cells regulate their division by communicating with each other using chemical signals from special proteins called cyclins. These signals act like switches to tell cells when to start dividing and later when to stop dividing.
Cells control their division by communicating with each other using chemical signals from special proteins which is known as cyclins.
What is Cell division?Cell division is defined as the process by which a parent cell divides into two daughter cells usually as part of a larger cell cycle in which the cell grows and changes its chromosomes before dividing.
A single cell divides to give rise to two cells where these two cells then divide to form four cells, and so on. This process is called "cell division" and "cell reproduction" because new cells are formed when old cells divide. This plays an important role in all living organisms which is essential for growth, repair and reproduction.
This process helps in:
Renewing of damaged cells. Production of new cells from older ones.Thus, cells control their division by communicating with each other using chemical signals from special proteins which is known as cyclins.
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1. There are
domains.
1
2
3
4
Answer:
3
Explanation:
There are three domains of life, the Archaea, the Bacteria, and the Eucarya.
Answer:
There are 3 domains
Explanation:
the Archaea, the Eucarya, the Bacteria.
Which of the following scenarios represents change to an ecosystem brought about by biotic factors?
a.
a wildfire caused by lightning striking a tree
b.
a flood caused by a severe storm
c.
a landslide caused by cattle overgrazing
d.
a volcano
Please select the best answer from the choices provided
A
B
C
D
Answer:
C
Explanation:
Which is the BIGGER (less specific) group? *
A. Phylum
B. Kingdom
C. Species
Answer:
C
Explanation:
These groups, from largest to smallest are Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.
Which food preservation technique is Paul using?
Paul uses____ technique, which is the most modern technique of food processing and preservation. This technique uses____ rays to kills Insects, mlcrobes, bacteria, and fungi In food.
1. Freeze drying
2. Irradiation
3. Dehydration
__________
1. Alpha
2. Beta
3. Gamma
Answer:
Paul uses Irradiation. The technique uses gamma rays
Explanation:
Answer:
Agreed.
irradiation
gamma
Explanation:
What is the omnivore(s)
Answer:
omnivores are animals that eat plants and animals
Explanation:
Answer:
Kit fox
Explanation:
Omnivores means the predator eats both plants and animals.
read the articles, "Groundwater Use and Overuse" and "Hudson River"
1. In the simulation, what happened to the stream as the water table dropped? What will happen to the groundwater if a pollutant is added to the stream? ~
2. Predict long-term changes to the surface landscape of the area if too much water is drawn from the ground and the water table drops further. ~
A student claims that the lac operon is an example of a mechanism that an organism uses to conserve energy. Evaluate the validity of the student's claim. The claim is invalid because the lac operon requires a bacterial cell to produce extra regulatory proteins and regulatory segments of DNA. The claim is valid because the lac operon allows a bacterial cell to shut down a metabolic pathway if it is not immediately needed. The claim is valid because the lac operon allows a bacterial cell to maintain constant levels of enzymes even when they are not immediately needed. The claim is invalid because the lac operon requires a bacterial cell to constantly produce the lac repressor protein even when lactose is not present.
Answer:
The claim is valid because the lac operon allows a bacterial cell to shut down a metabolic pathway if it is not immediately needed.
Explanation:
The lac operon is a cluster of genes which contain the same promoter sequence and are transcribed as a single messenger RNA (mRNA). This operon is inducible because the presence of lactose in the cell influences its transcription. Lactose can bind to the repressor of this operon, leading to a conformation change in the repressor, thereby preventing the repressor from binding to the operator and thus allowing transcription of the structural genes. After lactose addition, the β- galactosidase enzyme can break this carbohydrate into glucose and galactose, thereby there is no lactose able to bind with the repressor and therefore this operon shuts down. During transcription, the promoter of the lac operon binds both RNA polymerase and catabolite activator protein (CAP) and cyclic AMP (cAMP) complex.
Which of these best explains why mosquito populations show an exponential increase followed by a die off on a seasonal basis with a regular pattern?
Answer:
B) Mosquitoes are limited by temperature, with reproduction levels high in the spring and summer and low in the fall and winter.
Explanation:
Mosquitoes are limited by temperature, with reproduction levels high in the spring and summer and low in the fall and winter.
Answer:
B. Mosquitoes are limited by temperature, with reproduction levels high in the spring and summer and low in the fall and winter.
-Explanation:
Since mosquitoes reproduce when the temperatures are warm, their populations undergo a predictable increase in the warmer months. The first frost will kill many of the larvae and decrease the reproduction of these short-lived individuals.
when an organism reproduces through asexual reproduction, how many parent organisms contribute DNA to the offspring?
Answer:
Asexual reproduction produces offspring from just one parent. These offspring are genetically identical to that one parent.
Explanation: