Independent Assortment Video Lessons

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Problem: A violet-flowered, long-stemmed hybrid pea plant was crossed with a true-breeding white-flowered, short-stemmed pea plant with the following offspring: 47 violet, long-stemmed plants; 40 white, long-stemmed plants; 38 violet, short-stemmed plants; and 41 white, short-stemmed plants. If two of the white, long-stemmed plants above were crossed, you would expect to get which of the results listed below?A. all white, long-stemmedB. 1/2 white, short-stemmed; 1/2 white, long-stemmedC. 3/4 white, long-stemmed; 1/4 white, short-stemmedD. 9/16 violet, long-stemmed plants; 3/16, white, long-stemmed plants; 3/16 violet, short-stemmed plants; 1/16 white, short-stemmed plantsE. They do not all have the same genotype so the expected progeny can not be determined

FREE Expert Solution

From the given problem, note that the parents of the first cross was a dihybrid (let's say VvLl) and a homozygous recessive (vvll). The possible genotype ratio of the offspring for this cross is 1 VvLl : 1 Vvll : 1 vvLl : 1 vvll. This does not deviate far from the given offspring.

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Problem Details

A violet-flowered, long-stemmed hybrid pea plant was crossed with a true-breeding white-flowered, short-stemmed pea plant with the following offspring: 47 violet, long-stemmed plants; 40 white, long-stemmed plants; 38 violet, short-stemmed plants; and 41 white, short-stemmed plants. If two of the white, long-stemmed plants above were crossed, you would expect to get which of the results listed below?

A. all white, long-stemmed

B. 1/2 white, short-stemmed; 1/2 white, long-stemmed

C. 3/4 white, long-stemmed; 1/4 white, short-stemmed

D. 9/16 violet, long-stemmed plants; 3/16, white, long-stemmed plants; 3/16 violet, short-stemmed plants; 1/16 white, short-stemmed plants

E. They do not all have the same genotype so the expected progeny can not be determined

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What scientific concept do you need to know in order to solve this problem?

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Based on our data, we think this problem is relevant for Professor Melkonian's class at CSU.