What three types of evidence allows us to determine whether organisms shared a common ancestor?

1 answer:

6 0

The evidence of common ancestry is based on study of three parameters; fossils record, homologies of various organisms, and study of biogeography. Fossils record determines the similarity and differences of bones as well as shells of different organisms over a given period of time. On the other hand, studying of homologies involves assessment of mitochondrial DNA and other proteins with an aim of finding similarity from one organism to another. Finally, Biogeography is the assessment of how continental drift might have separated organisms which had got common ancestry and they were living together.

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A survey reveals that 25 percent of a population of 1,000 individuals have attached earlobes (are homozygous recessive for the t

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Answer:

d. pxp +2pq

Explanation:

The formula for genotype frequency for a population in Hardy-Weinburg equilibrium is as under:

p² + 2pq + q² = 1

where, p = dominant allele

q = recessive allele

Here,

p² represents frequency of homozygous dominant genotype

2pq represents frequency of heterozygous genotype

q² represents frequency of homozygous recessive genotype

Also, although the genotypes p² & 2pq are different from each other yet phenotypically they both will collectively produce dominant trait i.e. free ear lobes not attached earlobes. So the term "p² + 2pq or pxp + 2pq" represents the frequency of the individuals who show the dominant phenotype in this particular population. Dominant phenotype will comprise 75% of the population.

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Answer:

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