Chromosome Xyz Homework

Name: 4 6. (5 points) Suppose that Jane and John are both carriers for galactosemia (a rare autosomal recessive disease.) If they have three children, what is the probability their three children will have three different genotypes? Show your work and Circle your answer. 6*1/4*1/4*1/2 = 3/16 = 0.1875 7. (6 points) Alex, his mother, his father, and his older sister have blood type B. His younger sister and his brothers have type O. Anna, her mother, her father, and her younger brother have type A. Her sister and her older brother have type O. If Alex and Anna have three children, what is the probability at least one of them will have type O? Show your work and circle your answer. (Chance of Alex is I B i) x (Chance of Anna is I A i) x (1-none have type O) = =(2/3) x (2/3) x (1-.75 3 ) = 0.257 = 25.7% 8. (7 points) If three six-sided dice are rolled, what is the probability that the total number of spots showing is 15? Show your work and Circle your answer = P[5, 5, 5] + P[6, 6, 3] P[6, 5, 4] =1/6^3 + 3*1/6^3 + 6*1/6^3 =10/216 = 5/108 =0.0463

Genes A and B are located 10cM from each other on a chromosome. Gene C is located 25cM from gene A and 15cM from gene B. What is the probability that the trihybrid ABC/abc will produce any kind of recombinant gamete?

23.5%

38.25%

0.75%

76.5%

1.5%

Genes A and B are located 10cM from each other on a chromosome. Gene C is located 25cM from gene A and 15cM from gene B. Assuming that Interference = 0, what is the probability that the trihybrid ABC/abc will produce an ABC gamete?

If you are given a recombination frequency of 34% between genes X and Y and 27% between X and Z, can you predict the order of the three genes?

If you are given a recombination frequency of 34% between genes X and Y and 27% between X and Z, can you predict the order of the three genes?

Yes; the order is Z-X-Y.

Yes; the order is X-Y-Z.

Yes; the order is X-Z-Y.

No; based on this data alone, the order could be Z-Y-X or X-Y-Z.

No; based on this data alone, the order could be X-Z-Y or Z-X-Y.

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