The hair color and freckle genes in humans are on two different chromosomes. Red hair (d)...

The hair color and freckle genes in humans are on two different chromosomes. Red hair (d) is recessive to dark hair (D) and freckles (f) are recessive to the homogenous skin coloration (F). Two people who are both heterozygous for both genes have a child.

A. What is the probability that their child will have red hair?

B. What is the probability that their child will have freckles?

C. What is the probability that their child will have red hair and freckles?

Linked Dihybrid Cross with Complete Dominance in Both Genes

6. Assume that the genes for tail length and fang length in Towson Tigers are tightly linked. Further assume that long tails (L) are dominant to short tails (l) and that long fangs (F) are dominant to short fangs (f). Tigers from two true breeding strains, one with long tails and short fangs and the other with short tails and long fangs are crossed to produce an F1 generation, then those cubs are mated to produce an F2 generation

A. What is the genotype of each of the original parents?

B. What is the genotype and phenotype of the cubs in the F1 generation?

C. What gametes can each of the F1 animals produce?

D. What proportion of the F2 animals will have long tails and short fangs?

E. What proportion of the F2 animals will have long tails and long fangs?

Sex-Lined Inheritance

7. In humans red/green color blindness is a recessive, X-linked trait. X^N is used to denote the normal vision allele and Xⁿ to denote the recessive allele. A color blind woman has children with a man who has normal vision.

A. What are the genotypes of each of the parents?

B. Is the probability that their first child will be a color blind son?

C. Is the probability that their first child will be a color blind daughter?

D. Wat proportion of their daughters would carriers for the trait?

Solutions

Expert Solution

gladiator answered 1 year ago

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