LAB 03 EXERCISE 10

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East Los Angeles College *

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111

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Biology

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Apr 3, 2024

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LAB 03 EXERCISE 10 o Due No due date e Points 10 e Questions 10 e Time Limit None Attempt History Attempt Time Score LATEST Attempt 1 492 minutes 9 out of 10 Score for this quiz: 9 out of 10 Submitted Feb 21 at 7:41pm This attempt took 492 minutes. Question 1 1/1 pts (Q001) So far, you have worked on Punnett squares that show monohybrid crosses- likelihoods for an offspring from two parents involving a single trait, such as tongue rolling. When conducting his research, Mendel devised a method known as a dihybrid cross, which allowed him to consider two different traits. Mendel's work on dihybrid crosses in pea plants helped him realize that traits are inherited separately (the law of independent assortment). Review Scenario Aon p. 77 of your lab manual to see an example of a dihybrid cross with Mendel's pea plants and how to interpret the outcomes of such a cross. Then work through Scenario B on pp. 78 of your lab manual. Consider two traits in humans: freckles (F) and widow's peak (W). Having freckles (F) is dominant over not having freckles (f), and having a widow's peak (W) is dominant over not having a widow's peak (w). » Suzy is heterozygous for freckles and widow's peak. José is homozygous recessive for freckles and widow's peak. « Suzy and José are about to have a baby, and they are curious about the likelihood that their child will inherit these traits. Use this information to fill in the Punnett square on p. 78 and answer the following questions. What is Suzy's genotype? Correct! FWw
FFWw FIWW FFWW FEEDBACK: Suzy is heterozygous for both freckles (Ff) and widow's peak (W/w). Question 2 1/1 pts (Q002) What is José's genotype? FWw Ww FFWWwW Correct! ffww FEEDBACK: José is homozygous recessive for both freckles (ff) and widow's peak (ww). Question 3 1/1 pts (Q003) What is/are the possible genotypes for a child of Suzy and José that will have freckles but not a widow's peak? FFww FWw Correct! Ffww FFww and Ffww ffww FEEDBACK: Because José is homozygous recessive for freckles, any of his and Suzy's children with freckles will have to be heterozygous (Ff). The only possible genotype of a child without a widow's peak is ww. Thus, a child of Suzy and José that will have freckles but not a widow's peak can only have the genotype Ffww. Question 4 1/1 pts (Q004) What is the likelinood that Suzy and José's child will have freckles but will not have a widow's peak?
0% Correct! 25% 50% 75% 100% FEEDBACK: From the Punnett square, you can see that the likelihood is 25% that Suzy and José will have a child with the genotype Ffww. Question 5 1/1 pts (Q005) What is/are the possible genotypes for a child of Suzy and José that will not have freckles but will have a widow's peak? ffww Correct! Ww fww Www and ffww FfWww FEEDBACK: Because José is homozygous recessive for widow's peak, any of his and Suzy's children with a widow's peak will have to be heterozygous (Ww). The only possible genotype of a child without freckles is ff. Thus, a child of Suzy and José that will not have freckles but will have a widow's peak can only have the genotype ffWw. Question 6 0/1 pts (Q006) What is the likelihood that Suzy and José's child will not have freckles but will have a widow's peak? 0% Correct Answer 25% You Answered 50% 75%
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