Brindle coloration is a black and brown striping pattern in some dogs. This fur coloration is controlled by different alleles at a single autosomal locus. There are three alleles, KB, kbr and ky. The KB allele is dominant over the other two alleles and produces a solid black color. The allele kbr produces the brindle color pattern and is dominant over the ky allele, which produces yellow fur. Give the genotypes of the parents and offspring in each cross. P: black X yellow; F1: ½ brindle and ½ black P: black X brindle; F1: ½ black, ¼ brindle and ¼ yellow P: brindle X yellow; F1: 100% brindle

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Hi, I'm having some trouble with this practice problem from my study guide. If anyone can explain it it would be very helpful!

Brindle coloration is a black and brown striping pattern in some dogs. This fur coloration is controlled by different alleles at a single autosomal locus. There are three alleles, KB, kbr and ky. The KB allele is dominant over the other two alleles and produces a solid black color. The allele kbr produces the brindle color pattern and is dominant over the ky allele, which produces yellow fur. Give the genotypes of the parents and offspring in each cross.

  1. P: black X yellow; F1: ½ brindle and ½ black
  2. P: black X brindle; F1: ½ black, ¼ brindle and ¼ yellow
  3. P: brindle X yellow; F1: 100% brindle 
Expert Solution
Step 1

Three alleles 

  • KB,
  • kbr
  • ky

K- dominant over the other two alleles which gives a solid black color. 

kbr - the brindle color pattern and is dominant over the ky allele.

ky allele - yellow fur. 

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