4. What are the genotypic and phenotypic expectancies for a cross between a and homozygous recessive...

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Answer 1

Answer #1

Let us take an example of Tall and Dwarf pea plants. Let the dominant allele be denoted by T and recessive allele be dominated by t.

Thus a heterozygous plant will be Tt and will be tall. A homozygous recessive plant will be tt and will be short.

A cross between these will be as follows (Tt X tt):

Gametes from parents

T

t

Tt

Tall

tt

Short

t

Tt

Tall

tt

Short

Thus we see that the genotypic and phenotypic expectancies are equal, i.e. 1:1.

Tt : tt is 1:1 whereas tall and short ratio is also 1:1

Answer 2

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