Question

You are studying hair color in a population of cattle.  You have determined that cattle that are homozygous for one allele (the “red” allele) have red hair and cattle that are heterozygous (for the “red” allele and the “white” allele) have a mix of red and white hair.  You never observe live cattle that are homozygous for the white allele and have determined that cattle with this genotype have white hair but do not survive and are always stillborn.  In your population, 75% of the cattle have red hair and 25% of the cattle have a mix of red and white hair.  Cattle with a mix of red and white hair have an average of 1 offspring while cattle with red hair have an average of 2 offspring.

1) When considering viability, the red allele is ____________ to the white allele.

recessive

epistatic

dominant

complementary

reduced

2) Cattle with a mix of red and white hair have a _________ fitness compared to red-haired cattle.

higher

lower

undetermined

equal

3) The frequency of the white allele in the population is

50%

25%

12.5%

75%

0%

4) Because the gene affects both coat color and viability, it can be described as

pleiotropic

perfected

dominant

polymorphic

polygenic

Answer 1

1)dominant

others are false

epistasis and complementary are used in gene- gene interaction

red allele is not recessive

2) cattles with mic of red and white hair (heterozygous population) has lower fitness as they produce only 1 offspring as compared to red hair cattle(homozygous dominant)

3)12.5%

Frequency of recessive allele =2*aa+Aa/200=2*0+25/200=.125 in percent it will be 12.5%

4)pleiotropic as one gene is producing more then one phenotype

others are false as

dominant is an used to describe allele

polymorphic is when there are two or more form of a trait

polygenic is when more then one gene is responsible for a single trait

sorry I submitted the answer accidentally before I could complete it