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Question

A tall violet flowered plant (TTVV) is crossed with a dwarf white flowered plant (ttvv). When the F1 plants are self pollinated, a total of 1600 F2 plants are produced. Among them, how many plants are tall with white flowers?


A

900

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B

600

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C

300

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D

100

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Solution

The correct option is D

300


This is a typical dihybrid cross. Both parents are homozygous, so two different types of gametes will be formed- (TV) and (tv) respectively. The F1 plant will be heterozygous with the genotype (TtVv). Four different gametes are formed by the F1 plants- (TV), (Tv), (tV), (tv).


As you can see from the Punnett tool, the phenotypes in the F2 progeny are observed in a 9:3:3:1 ratio. Among these, tall plants with white flowers are one (TTvv) and two (Ttvv), thus a total of 3- recombinants which are produced 3 times in every 16 progenies. Hence out of 1600 plants, 3161600=300 are tall plants with white flowers.


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