Question

Check your understanding

Answer 1

The fraction of offspring with black coat color and straight fur is 9/16.

Explanation:

Information given:

black coat colour and straight fur - dominant genotype BBCC, BbCc

yellow coat colour and curly fur - recessive genotype  bbcc

Both the traits are independently assorted. The fur colour and fur type is not present on the same chromosome and are not sex linked.

The genotype of the parents are:

BbCc X BbCc

Punnet square shows:

          BC           Bc          bC        bc

BC  BBCC   BBCc        BbCC   BbCc

Bc  BBCc   BBcc          BbCc    Bbcc

bC BbCC    BbCc         bbCC   bbCc

bc  BbCc      Bbcc         bbCc    bbcc

9 BLACK STRAIGHT

 3 BLACK CURLY

 3 YELLOW STRAIGHT

  1  YELLOW CURLY

9/16 is the fraction of progeny to be black coat colour and straight fur.