Need some help in this bio question

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bradnoell
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Need some help in this bio question

Post by bradnoell » Thu Feb 05, 2015 2:33 am

Hi There,

I need some help with concepts related to Mendel and the Gene.

Here are the questions:

1) Given that The leaf shape gene of a plant has two alleles: A and a. A is completely dominant to a, and results in oval, rather than round leaves. Given the following cross, what is the F1 generation?
Cross: Aa x aa


a) 1AA: 2Aa: 1aa
b) 1AA: 1aa
c) 1Aa: 1aa
d) 3Aa: 1aa

2) Using the cross in the previous question, if you allowed plants with round leaves from the F1 generation to self-fertilize, could you obtain offspring (F2 plants) with the genotype AA? If so, which proportion would you expect?

a) 0, you could not get this genotype
b) 1/4 would be AA
c) 1/2 would be AA
d) 3/4 would be AA

3) Using the cross from the previous questions, if you allowed plants with oval leaves from the F1 generation to self-fertilize, could you obtain offspring (F2 plants) with the genotype AA? If so, which proportion would you expect?

a) 0, you could not get this genotype
b) 1/4 would be AA
c) 1/2 would be AA
d) 3/4 would be AA

4) What proportion of the F2 offspring produced in the previous question would you expect to have oval leaves?

a) 0, you could not get this genotype
b) 1/4 would have oval leaves
c) 1/2 would have oval leaves
d) 3/4 would have oval leaves


I would really appreciate it if someone can help explain this. Thanks!

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