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You have a dog that drools (d). It turns out that this is a Mendelian trait and recessive in the population of dogs. You breed this drooling dog with another dog that does not drool and is heterozygous for the non-drooling trait. The possible allele combinations for the cross between the drooling dog and non-drooling dog are: Group of answer choices

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Complete question:

You have a dog that drools (d). It turns out that this is a Mendelian trait and recessive in the population of dogs. You breed this drooling dog with another dog that does not drool and is heterozygous for the non-drooling trait. The possible allele combinations for the cross between the drooling dog and non-drooling dog are: Group of answer choices.

The possible allele combinations for the cross between the drooling dog and non-drooling dog are:

  • Only dd
  • Dd and dd, but not DD
  • Only Dd
  • DD, Dd, and dd

Answer:

  • Dd and dd, but not DD
  • Drooling dog gametes → d, d
  • Non-drooling dog gametes → D, d
  • F1) 1/2 dd + 1/2 Dd (No DD)

Explanation:

Available data:

  • Autosomal diallelic gene
  • The D allele is dominant and expresses the non-drooling trait
  • The d allele is recessive and expresses the drooling trait
  • Cross: A dog that drools with a heterozygous dog that does not drool.

Parentals) dd    x    Dd

Gametes) d   d     D    d

Punnett square)   D     d

                       d   Dd   dd

                       d   Dd   dd

F1) 1/2 = 50% of the progeny is expected to be non-drooling dogs, Dd

     1/2 = 50% of the progeny is expected to be drooling dogs, dd.

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