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In peas, axial flowers (A) are dominant over terminal flowers (a). What are the expected phenotypic...

In peas, axial flowers (A) are dominant over terminal flowers (a). What are the expected phenotypic ratios for the following crosses ?

a. homozygous axial x terminal

b. heterozygous axial x terminal

c. heterozygous axial x heterozygous axial

Solutions

Expert Solution

Pea plant with homozygous axial flowers (dominant) - AA

Pea plant with homozygous terminal flowers (recessive) -aa

a. cross between homozygous axial x terminal - AA x aa

A A
a Aa Aa
a Aa Aa

The phenotype for this cross is: All pea plants will be with axial flowers which are heterozygous for the trait.

( genotype =Aa)

b. Heterozygous axial x terminal - Aa x aa

A a
a Aa aa
a Aa aa

The progeny of this cross will be in 1:1 ratio. 50% of the plants will be with axial flowers which are heterozygous for the trait and 50% of the plants will be with terminal flowers.

c. Heterozygous axial x heterozygous axial -Aa x Aa

A a
A AA Aa
a Aa aa

The progeny for this cross will be : Phenotypic ratio is 3: 1 ( 3pea plants with AA and Aa will be with axial flowers and i pea plant with genotype aa will be with terminal flowers).

Genotypic ratio for this cross will be: AA:aa:aa in 1:2:1 ratio. ( 1 homozygous axial flowers(AA): 2 heterozygous axial flowers(Aa): 1 terminal flowers(aa).

gladiator answered 2 years ago
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