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A tabby, short haired male (TtbLl) is crossed with a blotched tabby, short haired (tbtbLl) female. Determine ratios of the offspring.

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Answer:

Genotypic ratios:

TtbLL: TtbLl: Ttbll: tbtbLL: tbtbLl: tbtbll

1:2:1:1:2:1

Phenotypic ratios:

3 Tabby long hair

1 tabby short hair

3 blotched tabby short hair

1 blotched tabby short hair

Explanation:

  • The genotype Ttb represents tabby fur coat.
  • tbtb genotype represents blotched tabby fur coat.
  • Long hair (ll) is a recessive genotype.
  • Short hair (Ll or LL) is the dominant genotype.
  • The following Punnet square represents the dihybrid square.

Punnet Square:

      TL        Tl         tbl         tbl  

tbl  TtbLL  TtbU  tbtbLL    tbtbll  

tbl  TtbU   Ttbll    tbtbll      tbtbll  

tbl  TtbLL  TtbU   tbtbLL    tbtbll  

tbl  TtbU   Ttbll    tbtbLI     tbtbll

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