Answer: 1.251 billion years
Explanation: The half-life of potassium 40 is 1.251*10^9 years. Since in the igneous rock there is one half of potassium left it means only one half-life has passed.
Cross a person who does not have freckles and is heterozygous for dimples with a person who has
freckles (but her mom does not) but no dimples.
1. What is the probability that these parents will have a child with dimples?
2. What is the probability that these parents will have a child with freckles?
3. What is the probability that these parents will have a child with dimples and freckles?
Answer:
1. 1/2
2. 1/2
3. 1/4
Explanation:
Let the allele for freckles be A or a while that of dimples be B or b.
A person without freckles but heterozygous for dimples = aaBb
A person who has freckles (whose mother has no freckles) but no dimples = Aabb
aaBb x Aabb
Offspring
4 AaBb - freckled and dimpled
4 Aabb - freckled and non dimpled
4 aaBb - non freckled and dimpled
4 aabb - non freckled and non dimpled
1. Probability that the parents will have a dimpled child = 8/16 or 1/2
2. Probability that they will have a child with freckles = 8/16 or 1/2
3. Probability that they will have a child with freckles and dimples = 4/16 or 1/4
See the attached image for the Punnet's square analysis of the cross
What are two definitions of evolution, and why does evolution occur?
Answer:
the gradual progression of a species
Explanation:
as a species migrates it requires new adaptions to better survive and thrive in the new environment.
When reproducing, Robins (a species of bird) typically lay four eggs. Laying more eggs might result in malnourished chicks and laying fewer eggs might result in no viable offspring. This is an example of
Answer:
stabilizing selection
Explanation:
The illustration is an example of stabilizing selection.
Stabilizing selection is an evolutionary mechanism in which the extremes of traits are selected against, leading to an increase in the frequency of such traits in the population.
Laying too many eggs would lead to reduced fitness of the population of the bird as a result of malnutrition while laying too few eggs would lead to a reduction in the population. Reproduction needs to be optimized for maximum fitness.
There are different types of natural selection. One of them is stabilizing selection that favors the intermediate phenotype. The exposed scenario is an example of stabilizing selection.
Balancing selection, also called Stabilizing selection, decreases the frequency of individuals with extreme traits, and favors individual that exhibit medium-range characteristics, that gets to survive. Selective pressure is against h0m0zyg0tes, promoting genetic diversity. Genes expressing extreme characteristics in a h0m0zyg0sis are kept in a heter0zyg0us state, as a favorable adaptation to environmental conditions. In a graph, you will see that
→ The curve gets higher and thinner in the middle of the horizontal axe, indicating an increase in the heter0zyg0us genotype frequency.
→ The tails of the curve that coincides with h0m0zyg0us dominant and recessive genotypes frequencies will be near zero.
In the exposed example,
laying more than four eggs and less than four eggs are extreme phenotypes. laying four eggs is an intermediate favored phenotype.
The intermediate phenotype results in the species' fitness increase, so it is favored by natural selection.
Laying four eggs leads to well-nourished chicks, and all of them get to survive. Parents ensure their reproductive success.
You will learn more about stabilizing selection at
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What are paired chromosomes called?
Answer:
Humans have 23 pairs of chromosomes--22 pairs of numbered chromosomes, called autosomes, and one pair of sex chromosomes, X and Y. Each parent contributes one chromosome to each pair so that offspring get half of their chromosomes from their
Select all that apply to the evidence of evolution:
A homologies- anatomical, molecular, and developmental
B biography
C natural selection
D fossil record
pls help!!
Select all the true statements about density: (hint - there are 4 correct statements)
d=m/v (denisty equals mass divided by volume)
density is measured in meters
density is the ratio of an objects mass to its volume
objects that are heavy for their size are very dense
objects that are heavy for their size are not dense
density is how much matter is in a given amount of space
all dense objects will float
(there is more then 1 answer by the way)
answer
2nd is wrong
5th is wrong
last is wrong
6CO2 + 6H20 602 + C6H1206
Molecular Energy in Photosynthesis
Name of
Molecule
Chemical
Formula
Amount of Energy per
Molecule (in kJ per mole)
Carbon dioxide
CO2
799
Water
H20
467
Oxygen
O2
495
Glucose
C6H1206
9,467
Which statement correctly describes the flow of energy in photosynthesis?
A Photosynthesis releases energy when carbon dioxide and water combine to form glucose molecules.
B Photosynthesis releases energy when the reactants rearrange and form the bonds in the products,
Photosynthesis stores energy because energy is released when glucose is formed from carbon dioxide and water.
D Photosynthesis stores energy because more energy is stored in glucose than it is in carbon dioxide or water.
Answer:
Photosynthsis stores energy because more energy is stored in glucose than it is in carbon dioxide or water is the correct answer.
Explanation:
Emerging ____________ may result from new and/or increased exposure to animal or insect populations and can be rapidly transported to vast areas because of ____________ .
Answer:
Emerging Diseases may result from new and/or increased exposure to animal or insect populations and can be rapidly transported to vast areas because of Globalization.
Explanation:
what happens to the carbon and oxygen from CO2 after it has been removed from the air by the plant via photosynthesis
Answer:
Plants absorb carbon dioxide from the air and use it to feed themselves in the process called photosynthesis. The carbon dioxide, through tiny pores called stomata, reaches the leaves of the plant. ... The factory emits Oxygen, or O2, into the ambient air until the process is finished.
Explanation:
After the removal of CO2 from air by the plant, then Carbon would be absorbed by plant, Oxygen will be emitted into the air.
Photosynthesis can be regarded as the process which involve the use of sunlight , carbon dioxide and water by plant, so that to oxygen can be created as we as energy in the form of sugar.After the absorption of the CO2 from atmosphere by plant through the stomata, the plant convert it into carbon and oxygen, and the oxygen will be released to the air.Therefore, the process is called Photosynthesis
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please what is the adaptive behaviour of a mosquito