HELP ASAP When were stem cells first removed from embryos? Why is this controversial?
What are the current U.S. laws regarding embryonic stem cells? In your
opinion, should scientists continue research with stem cells, or if you had a
disease and would benefit from the stem cell therapies, would you want
scientists to continue their research?

Answers

Answer 1

Answer:

They should not continue with research of stem cells

Explanation:

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Copernicus and other astronomers before him thought that celestial bodies followed a _____ orbital path.circular
elliptical
square

Answers

Copernicus and other astronomers before him thought that celestial bodies followed a circular orbital path.

Answer: circular - first choice

What does soil have to do with climate change?

Answers

Answer:

if the soil is what supports trees then if the soild is too acidic for exapmle a certain species of tree may not grow and say it affects conifers which are widespread in cold climates those areas will build up carbon dioxide

Explanation:i hae no idea what the biological reason is i just used my understanding of science and logic to thick it out hope this helps and god bless

A group of cells that have t he same function is called

Answers

The group of cells that have the same functions is called a tissue

Suppose the human trait for freckles is controlled by a simple dominant and recessive relationship at one locus. Freckles, F, is the dominant allele, and a lack of freckles, f, is the recessive allele. In a college genetics class, the professor takes a tally of students who have freckles and of students with a lack of freckles. In this class of 123 students, 98 have freckles. Calculate the frequency of the dominant allele, F, and the heterozygous genotype Ff. Express the frequencies in decimal form rounded to the nearest thousandth. Assume the class is in hardy-Weinberg equilibrium for this trait.

Answers

Answer:

0.549 is the frequency of the F allele.

0.495 is the frequency of the Ff genotype.

Explanation:

FF or Ff genotypes determine freckles, ff determines lack of freckels.

In this class of 123 students, 98 have freckles (and 123-98= 25 do not).

If the class is in Hardy-Weinberg equilibrium for this trait, then the genotypic frequency of the ff genotype is:

q²= 25/123

q²=0.203

q= $\sqrt{0.2$

q= 0.451

q is the frequency of the recessive f allele.

Given p the frequency of the dominant F allele, we know that:

p+q=1, therefore p=1-q

p=0.549 is the frequency of the F allele.

The frequency of the Ff genotype is 2pq. Therefore:

2pq=2×0.549×0.451

2pq=0.495 is the frequency of the Ff genotype.

Final answer:

The frequency of the dominant allele, F, in this class is 0.55. The frequency of the heterozygous genotype, Ff, is 0.495. This is calculated using Hardy-Weinberg equilibrium and observed phenotype frequencies.

Explanation:

To start, we need to calculate the frequency of the recessive allele, f, which is easily calculated as those who do not have freckles. From a total of 123 students, 98 have freckles, leaving 25 students with no freckles, which represents individuals who are homozygous for the recessive trait (ff). As these are the only individuals we can be sure of, we take the square root of their frequency to get the frequency of the recessive allele, q. In this case, q = sqrt(25/123) = 0.45. To find the frequency of the dominant allele, p, we subtract q from 1 (because p + q = 1), so p = 1 - q = 0.55.

Next, we'll calculate the frequency of the heterozygous genotype Ff.

Using Hardy-Weinberg equilibrium, we know this is represented by 2pq. Hence, the frequency of genotype Ff would be 2 × 0.55 × 0.45 = 0.495.

This process offers an example of applying the principles of population genetics and Hardy-Weinberg equilibrium to determine the likely genotype frequencies in a given group of individuals based on observed phenotype frequencies.