Quiz: Advanced Genetics

In Wisconsin Fast Plants, purple (P) stems is dominant to green stems. Green (G) leaves are dominant to yellow leaves.

1. A plant with purple stems and green leaves (PpGg) is self pollinated. What are the phenotypic ratios of the offspring?

 

2. A plant with purple stems and green leaves (PpGg) is crossed with a plant that has green stems and yellow leaves.. What are the phenotypic ratios of the offspring?

 

3. A plant that is homozygous dominant for both traits is crossed with one that has green stems and yellow leaves. What are the phenotypic ratios of the offspring?

 

4. A plant that is heterozygous for both traits is crossed with one that is heterozygous for purple stems and has yellow leaves. What are the phenotypic ratios of the offspring?

 

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Answers:

1. 9 purple stems, green leaves/ 3 purple stems, yellow leaves / 3 green stems, green leaves / 1 green stems, yellow leaves
2. 1:1:1:1
3. All tall and purple

4. PpGg x Ppgg

3/4 purple stems
1/4 green stems

1/2 green leaves
1/2 yellow leaves

3/4 * 1/2 = 3/8 purple stems, green leaves
3/4 * 1/2 = 3/8 purple stems, yellow leaves
1/4 * 1/2 = 1/8 green stems, green leaves
1/4 * 1/2 = 1/8 green stems, yellow leaves

 

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