4.) a.) you are a dog breeder specializing in Alaskan malamutes. within this bre

Question

4.) a.) you are a dog breeder specializing in Alaskan malamutes. within this breed is a recessive genetic defect causing day blindness, where affected dogs have a hard time seeing in the daylight. your new breeding pair, both with normal vision, produced 10 puppies a year ago. two of the puppies from that litter are day blind. based on this information, what is the genotype of the parents and the affected offspring?
b.) if inbreeding was to occur between one of the affected offspring and its parent what would be the expected ratio of normal to day-blind offspring?
(PLEASE SHOW YOUR WORK)

Explanation / Answer

a recessive genetic defect causing day blindness,--

the parents are --------- heterozygous ,genotype----------Cc

affected offspring--------- homozygous ,genotype----------cc
b.) if inbreeding was to occur between one of the affected offspring and its parent what would be the expected ratio of normal to day-blind offspring?

parents Cc    x cc affected offspring

C

c

c

Cc heterozygous,normal

cc affected

c

Cc heterozygous,normal

cc affected

expected ratio of normal to day-blind offspring= 1:1

C

c

c

Cc heterozygous,normal

cc affected

c

Cc heterozygous,normal

cc affected

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