Biology, 27.07.2019 13:30 bellam302

In a particular species of frogs, black spots are a dominant trait and their absence is a recessive trait. in a population of frogs, 50 are homozygous for the dominant trait, 34 are heterozygous dominant, and 16 show the recessive trait. which expression is the correct way to calculate the frequency of the dominant allele?

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Answer from: Animallover100

The answer is C: 134/200

Answer from: c4thegoat

The allelic frequency is the frequency with which the allele of a variant in a population is found (expressed as percentage or portion). The sum of the allelic frequencies of all the alleles of a gene in a population is therefore by definition equal to 1. In population genetics, allelic frequencies represent the genetic diversity at the level of the population, or species.

To calculate it, it is considered that each frog has two alleles in its genome coding for black spots.

Allelic frequency = number of allele considered / total number of alleles = number of allele considered / total number of frogs * 2

Homozygous domianant means that it has two alleles for black spots, and heterozygous means that it has only one allele for black spot.

Allelic frequency of dominant allele = $\frac{50 * 2 + 37 * 1 }{(50 + 34 + 16) * 2}$ = 134/200 = 0.67.

Answer from: Quest

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.

Answer from: Quest

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