Genetic Frequency Calculations

This video tutorial explores solving Hardy-Weinberg problems using various examples, including butterfly and horse populations. It covers calculating allele frequencies, determining genotypes, and understanding the relationship between phenotype and genotype. The tutorial emphasizes solving for the recessive allele frequency first and provides step-by-step calculations for different scenarios, including a hypothetical example with leopard geckos.

In a population of 600 butterflies, 54 have pink wings. What is the total number of alleles in the gene pool?

• 54

• 546

• 1200

• 600

If 9% of a butterfly population is homozygous recessive, what is the frequency of the recessive allele?

• 0.49

• 0.09

• 0.7

• 0.3

What percentage of the butterfly population is homozygous dominant if p = 0.7?

• 9%

• 70%

• 49%

• 30%

How do you calculate the percentage of heterozygous individuals in a population?

• q^2

• 2pq

• p + q

• p^2

In a population of 350 horses, 16% express the recessive phenotype. What is the frequency of the recessive allele?

• 0.36

• 0.6

• 0.4

• 0.16

If 36% of a horse population is homozygous dominant, how many horses are homozygous dominant in a population of 350?

• 36

• 210

• 84

• 126

If 84% of a population expresses the dominant phenotype, what is the frequency of the dominant allele?

• 0.84

• 0.16

• 0.6

• 0.4

In a population of leopard geckos, 572 out of 1789 have white skin with brown spots. What is the frequency of the recessive allele?

• 0.51

• 0.49

• 0.26

• 0.24

What percentage of the leopard gecko population is homozygous dominant if p = 0.51?

• 50%

• 49%

• 26%

• 24%

How can you check if your genotypic frequencies add up correctly in a population?

• 2pq = 1

• p^2 + q^2 = 1

• p + q = 1

• p^2 + 2pq + q^2 = 1