A plant with the genotype Aa, bb, Cc, Dd, Ee makes _____ different types of game

Question

A plant with the genotype Aa, bb, Cc, Dd, Ee makes _____ different types of gametes. A. 4 B. 6 C. 8 D. 16 E. 32 You are a petunia breeder and have isolated a patch of pure-white petunias. One day, quite by surprise, you find that one of the petunias in the patch has produced an offspring that has pale pink flowers. You wish to select for more pale pink petunias, so you "self" the pale pink plant (fertilize its carpels with its own pollen). The result is 156 pale pink: 311 white. This suggests that A. all pale pink petunias are heterozygous B. Flower color is petunias is under the control of more than one gene. C. It will be possible to produce a strain of pure-breeding pale pink petunias (as long as the pale- pink ones are permanently isolated from the pure-breeding white ones). D. The allele for pale pink flowers is recessive and semi-lethal. E. The allele for pale pink flowers is X-linked.

Explanation / Answer

9 answer D16

Formula 2n where n is number of heterozygous alleleic pairs. In this example there are four heterozygous alleles so 24=16

10. All pale pink petunias are heterozygous

This is case of lethal genes. Where WW produces white colour Flowers, W WP produces pink flowers, Wp Wp is lethal.

Two pink crossed produces 156 White and 311 Pink

Supporting :

1 WW: 2 WWp

1 WHite: 2 Pink

W Wp W WW (White) WWp (Pink) Wp WWp (Pink) WpWp (Lethal)

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