Use the interactive Punnet Squares Level 2 to answer the following questions. Su

Question

Use the interactive Punnet Squares Level 2 to answer the following questions. Suppose the parents indicated in the interactive produced 208 peas. Determine the expected number of yellow and wrinkled offspring Number Now suppose one of the pea plants is homozygous recessive for both genes, resulting in the cros Yy Rrxyy IT. Calculate the percentage of yellow and wrinkled offspring Number Suppose one of the pea plants is homozygous recessive for seed color, resulting in the cross Yy Rr xyy Rr. Which of the following represents the ratio of phenotypes of the offspring? O 9 yellow, round 3 yellow, wrinkled: 3 green, round 1 green, wrinkled O 4 yellow, round: 4 yellow, wrinkled :4 green, round: 4 green, wrinkled O 6 yellow, round 6 yellow, wrinkled 2 green, round: 2 green, wrinkled O 6 yellow, round 2 yellow, wrinkled 6 green, round 2 green, wrinkled

Explanation / Answer

I am assuming that Y is yellow and dominant and y is green and recessive.

Yy Rr x yy rr

Each parent's genes will segregate. Yy Rr can segregate into the following: YR, Yr, yR and yr.

yy rr has only one possibility of gamete genotype: yr.

Punnett square will be as follows.

Out of the four possible outcomes, there are only 4 possibilities where the offspring will be yellow and wrinkled.

Therefore, the probability is 4 out of 16 : 4/16 = 1/4 = 0.25 = 25%

Yy Rr x yy Rr

Yy Rr will segregate into YR, Yr, yR and yr. ( all combinations)

yy Rr will segregate into yR, yr. (all combinations)

The punnett square will be as follows:

(Assuming Y is yellow)

Yr YR yR yr yr Yyrr (Yellow and wrinkled) YyRr (Yellow and round) yyRr (green and round) yyrr (green and wrinkled) yr Yyrr (Yellow and wrinkled) YyRr (Yellow and round) yyRr (green and round) yyrr (green and wrinkled) yr Yyrr (Yellow and wrinkled) YyRr (Yellow and round) yyRr (green and round) yyrr (green and wrinkled) yr Yyrr (Yellow and wrinkled) YyRr (Yellow and round) yyRr (green and round) yyrr (green and wrinkled)

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