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Two short-haired cats mate and produce six short- haired and two long-haired kittens. What does this information suggest about how hair length is inherited?

Respuesta :

Answer:

In the progeny, six kittens were short haired and two were long haired. The ratio of short to long haired kittens is 3:1 which is a classic monohybrid cross ratio. Here, short hair is inherited dominantly and long hair is inherited recessively.  Both the parents are heterozygous for short hair trait (Ss). Cross between them:

Ss X Ss :

   S      s

S  SS   Ss

s   Ss    ss

Genotypically: 1    :    2    :    1

                      SS      Ss       ss

Phenotypically:   3         :      1          = 6 short and 2 long haired kittens

                       short hair   long hair

Hence short hair is dominant over long hair in these cats.

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