Question

Elizabeth is married to John, and they have four children. Elizabeth has a straight nose (recessive) and is able to roll her tongue(dominant). John is also able to roll his tongue, but he has a convex(Roman) nose( dominant). Of their four children, Ellen is just like her father and Dan is just like his mother. The other children- Anne, who has a convex nose and Peter who has a straight nose- are unable to roll their tongue. a. What are the genotypes of Elizabeth and John?

Answer 1

Answer:

Elizabeth has genotype Ttnn( roll tongue and straight nose)) John has genotype Ttnn( tongue roll and convex nose)

Answer 2

The answer is as follows:

Taking straight nose = nn and roman nose = NN, Nn, nn, and

rolling tongue = TT, Tt, tT and no rolling tongue = tt, we get the genotypes as:

• Elizabeth - nn, TT or Tt or tT
• John - NN or Nn or nN, TT, Tt, tT
• Anne - Nn, tt
• Peter - nn, tt
• Therefore the genotypes of Elizabeth and John are nnT_ (where the '_' can be of any type) and N_T_ (where the '_' can be any other type since the dominant trait is already present).
• Genotypes is the word used to define the genetic makeup of a living organism and is used to refer to the alleles.

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