In a particular plant, leaf color is controlled by gene D/d. Plants with the gen

Question

In a particular plant, leaf color is controlled by gene D/d. Plants with the genotype dd have light colored leaves while those with allele D will have dark green leaves. The F1 offspring of a cross between the trubreeding parents with different phenotypes are allowed to self-pollinate. The punnett square below represents true breeding parents outcome of this cross where 1,2,3 and 4 represent the genotypes of corresponding to the genotype in each box.
D d
D 1 2
d 3 4
which box responds to dark leaves,which reponds to heterozygous genotype and which one is true-breeding

Explanation / Answer

plant leaf colour is controlled by D and d

The genotypes with corresponding colours are

DD- green

Dd- green

dd- light coloured.

DD   dd

F1 offspring - Dd - green coloured

Cross between F1 offspring is

D

d

D

DD- green(homozygous)

Dd - green(heterozygous)

d

Dd - green(heterozygous)

dd - light

DD and dd are the true breeding types.

D

d

D

DD- green(homozygous)

Dd - green(heterozygous)

d

Dd - green(heterozygous)

dd - light

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