QUESTION 1 If Plant 1 has a genotype of YY and Plant 2 has a genotype of yy , wh

Question

QUESTION 1

If Plant 1 has a genotype of YY and Plant 2 has a genotype of yy, what is Plant 1's phenotype (the physical appearance of the plants' seeds)?

0.5 points   

QUESTION 2

If Plant 1 has a genotype of YY and Plant 2 has a genotype of yy, what is Plant 2's phenotype (the physical appearance of the plants' seeds)?

0.5 points   

QUESTION 3

What are the possible genotypes for offspring between Plant 1 and Plant 2?

1 points   

QUESTION 4

What are the possible phenotypes for offspring between Plant 1 and Plant 2?

1 points   

QUESTION 5

Now, trade one allele between plants such that each is heterozygous for the color trait. Fill in the Punnett Square below, with one plant's allele's in the dark boxes along the top, and the other plant's alleles in the dark boxes along the left.

1.5 points   

QUESTION 6

What are the possible genotypes for offspring between Plant 1 and Plant 2?

, ,

0.5 points   

QUESTION 7

What percentage of offspring would you expect to have each genotype?

YY %

Yy %

yy %

1 points   

QUESTION 8

What are the possible phenotypes for offspring between these two plants?

,

1 points   

QUESTION 9

What percentage of offspring would you expect to have each phenotype?

Yellow %

Green %

1 points   

QUESTION 10

Mendel developed his Law of Segregation after observing two generations of crossed pea plants. His first generation plants were homozygous(as were yours). The second generation of crossing happened between two heterozygous plants (as in Question 5).

Imagine that the prevailing hypothesis of the time is that traits from the mother and father tend to blend together in offspring. Why did the results of Mendel’s experiment prompt him to come up with the Law of Segregation instead?

Explanation / Answer

Ans1. Plant 1 phenotype - Yellow (dominant)

Ans2. Plant 2 phenotype - Green (recessive)

Ans3. Possible genotypes of offspring - Yy

Ans4. Possible phenotype of offspring - Yellow

Ans5.

Ans6. Possible genotype of offsprings - YY , Yy & yy.

Ans7. Percentage YY - 1/4 = 25%

Yy - 2/4 = 1/2 = 50%

yy - 1/4 = 25%

Ans8. Possible phenotype - Yellow and green

Ans9. Yellow - 3/4 = 75%

Green - 1/4 = 25%

Ans10. In the second cross (heterozygous), Mendel found that the offsprings showed no blending of the parental traits, they were either yellow or green. Both the parents were Yellow (Yy) and gave offsprings that were yellow or green, nothing in between. This prompted Mendel to come up with the law of segregation.

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