Question

1. If an original dog population has an allele with frequency 0.6 and a population size of 292 individuals and 55 dogs move from another population to join the original population and bring with them the same allele with frequency 0.6, what is the allele frequency in the new population (to two decimals - round to the nearest 0.01).

2. A group of Labrador Retriever males are imported carrying an allele frequency of 0.2. The existing Canadian population of Labradors has an allele frequency of 0.8. A follow up study of the purebred Labrador registration information shows that 30% of puppies registered in Canada after one year were sired by one of these foreign sires. What is the allele frequency in the Canadian male Labrador population? (to two decimal places and round to the nearest 0.01 - don't worry about the frequencies in the females, we will leave that for MBG-3060 next winter)

3. What proportion (to two decimal places - round to nearest 0.01) of a population reproduce where:
the frequency of the dominant allele is 0.6
26% of the heterozygotes are not sufficiently fit to reproduce and
43% of the homozygous recessive individuals are not sufficiently fit to reproduce?

Answer 1

1) In original dog population, an allele has a frequency of 0.6 in a population of 292 individuals. So, the allele is present in 175 dogs. From another population, 55 dogs move to join with the original population with allele frequency of 0.6. So, in this population, the allele is present in 33 dogs.

So, the allele frequency in the new population is,

= (175 + 33) / (292 + 55)

= 208/ 347

= 0.6

Please post other questions separately.