In a particular plant, three independently assorting genes ( Aa, Bb, Cc ) influe

Question

In a particular plant, three independently assorting genes (Aa, Bb, Cc) influence height, such that each dominant allele adds 4 cm to a base height of 2 cm. The recessive alleles do not add any height. You crossed a AABBcc plant with a AAbbCC plant.

A.How tall are the F1 plants?

B.If the F1 plants are crossed, how many different heights would be observed among the F2 progeny?

C.What would be the phenotypic ratio among the F2? (example of how to write is 9:3:3:1)

Please explain! Thank you very much!

Explanation / Answer

A. cross between AABBcc plant x AAbbCC plant

Each dominat allele adds 4 cm to base height of 2 cm.

AABB and AACC are dominant alleles in two parent plants

8 dominant alleles x 4 cm + 2 cm base height.

8 x 4 + 2 = 34cm. The F1 plants are of 34cm height.

B. When F1 plants are crossed, the F2 progeny result in heterozygous plants and in polygenic inheritance, the number of progeny produced = number of alleles involved + 1

In this corss 12 +1 = 13 and hence in F2 progeny, 13 different heights are observed.

The phenotypic ratio, out of 64 plants 12 types of possible gametes in F1 plants , in these 4 are 42cm, 4 are 34cm, 2 are 26cm, 2 are 50 cm and 2 are 18cm.

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