First slide

Inheritance of One Gene

Question

In Antirrhinum majus, red flower colour (R) is incompletely dominant over white flower colour (r), the heterozygous produces pink flowers. The pink flowers are back crossed to the red parent, what are the possible phenotypes of the offspring?

Easy

A

Red flowered plants only.
B

Red flowered plants and white flowered plants only.
C

Red flowered plants and pink flowered plants only.
D

Red flowered plants, pink flowered plants and white flowered plants.

Solution

In Antirrhinum majus, red flower colour (R) is incompletely dominant over white flower colour (r), the heterozygous produces pink flowers. The pink flowers are back crossed to the red parent then we get 50% of the offspring having red flowers and 50% of the offspring having pink flowers.

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