# Unit 5 Practice activity (1).pdf - Biol 1107 Unit 5: Pop...

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Biol 1107 Unit 5: Pop Gen and EvolutionPractice Problems1)Hair color in a breed of cattle is a co-dominant trait with two alleles. Some cattle have red hairs (R),some have white hairs (r), and some have a mixture of red and white hairs (Rr, roan). A rancher hasa large herd of cattle with 227 white cows, 396 red cows, and 442 roan cows. What are thefrequencies of the red and white alleles in this population?2)In mice, tail length is controlled by two alleles. Long tails (L) are dominant to short (l). The frequencyof the long tail allele is 0.65. Calculate each of the following.a)The frequency of the short-tailed allele in the population.b)If there are 1,000 mice in the population, how do you expect bei)Homozygous dominantii)Homozygous recessiveiii)Heterozygousc)How many mice do you expect to have long tails?3)The ability to digest lactose is controlled by one gene with two alleles. Tolerance (E) is dominant toIntolerance (e). Assuming the population is in Hardy-Weinberg equilibrium, calculate the following.a)In Ireland, 4% of the population is lactose intolerant.i)What is the frequency of the recessive allele?ii)What is the frequency of the dominant allele?iii)What proportion of the population do you expect to be heterozygous?iv)The republic of Ireland has a population of about 5 million. How many of the Irish do youexpect to be lactose intolerant?
Biol 1107 Unit 5: Pop Gen and EvolutionPractice Problemsb)In Vietnam, 98% of the population is lactose intolerant.i)What is the frequency of the recessive allele?ii)What is the frequency of the dominant allele?iii)What proportion of the population do you expect to be homozygous dominant?iv)Vietnam has a population of about 95 million. How many of the Vietnamese do you expectto be lactose tolerant?

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Term
Spring
Professor
Heil
Tags
Zygosity