Pea pod shape is controlled by a one gene - two allele genetic system. Full pod

Question

Pea pod shape is controlled by a one gene - two allele genetic system. Full pod shape is completely dominant to constricted pea pod shape. Pea plant size is also controlled by a one gene – two allele system with tall size being completely dominant to dwarf size. Given a plant was heterozygous for pod shape and homozygous recessive for plant size:

a. What is the phenotype of this plant?


b. If this plant was crossed to a dihybrid (heterozygote), what would be the phenotypic ratio of pod shape among the progeny?



c. What would be the phenotypic ratio of plant size?



d. What would be the phenotypic ratio of pod shape and plant size together?

Explanation / Answer

Pea pod shape is controlled by a one gene - two allele genetic system. Full pod shape is completely dominant to constricted pea pod shape. Pea plant size is also controlled by a one gene – two allele system with tall size being completely dominant to dwarf size. Given a plant was heterozygous for pod shape and homozygous recessive for plant size:

a. What is the phenotype of this plant?

Full pod shape is completely dominant to constricted pea pod shape.

Full pod shape---------F---------dominant     --allele

constricted pea pod shape--f---------recessive allele

tall size being completely dominant to dwarf size

tall size ---------- completely dominant -------T--allele

dwarf size------------recessive allele----------t     allele

plant was heterozygous for pod shape and homozygous recessive for plant size:

phenotype of this plant? : Full pod shape,dwarf size

b. If this plant was crossed to a dihybrid (heterozygote), what would be the phenotypic ratio of pod shape among the progeny?

        Ff tt x        Ff   Tt

1:2:1

1/4--------Homozygous FF Full pod shape

2/4-------heterozygous -Ff----Full pod shape

1/4- Homozygous tt constricted pea pod shape

c. What would be the phenotypic ratio of plant size?

Ff   tt x        Ff   Tt

1:1 -just like test cross

1 (tall ):1(dwarf )

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