The colour of tips of hair in Shepherd dog is controlled by a gene with three alleles B for Black, R for red and C...

      

The colour of tips of hair in Shepherd dog is controlled by a gene with three alleles B for Black, R for red and C for copper.
A cross between pure breeding red and copper hair tips produce offsprings with scarlet hair tips. Crossing pure breeding
red and black hair tips yields all red offsprings. A cross between pure breeds of copper and black produce offsprings that
are all copper.
a) Comment on the inheritance of the three alleles B, R and C.
b) A dog breeder wishes to know the genotype of a dog with red hair tips. State and explain the cross needed to determine
the dog’s genotype.
c) A mother of blood group AB was married to a man of blood group B heterozygous. What is the probability that one of
their sons would be blood group A? Show your working.

  

Answers

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a) R and C alleles are co-dominant;
R and C are dominant after B;
b) A test cross; a dog with red hair tips is crossed with a black dog (homozygous) recessive;

Probability =¼;

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sharon kalunda answered the question on May 27, 2019 at 09:37

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