1) If you cross a cut-winged female fly with a normal-winged male, all F1 males will be cut-winged and all F1 females will be normal-winged.

A. What is the likely inheritance pattern? Which allele is dominant? How can you tell?

B. The F1 offspring are crossed, and the following results are obtained:

C. State the null hypothesis. Be sure to include both biological and quantitative components.

D. State the alternate hypothesis.

E. Calculate the experimental chi-square value. Compare this to the critical value (alpha = 0.05).

F. Draw a conclusion about the null hypothesis.

G. Draw a biological conclusion.

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2) A student crossed lobed-eyed, tan-bodied female Drosophila with normal-eyed, black-bodied males. All the F1's were lobed-eyed and tan-bodied. She crossed the F1's and obtained the results given below.

A. State the null hypothesis. Be sure to include both biological and quantitative components. (For the quantitative predictions, you may want to construct Punnett squares).

B. State the alternate hypothesis.

C. Calculate the experimental chi-square value. Compare this to the critical value (alpha = 0.05).

D. Draw a conclusion about the null hypothesis.

E. Draw a biological conclusion.

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3) A woman who is heterozygous for both hemophilia and brown eyes marries a normal (i.e. non-hemophilic) blue-eyed man. Hemophilia is determined by a gene on the X chromosome. Assume (for the purposes of this question) that eye color is determined by a single autosomal gene.

a) What is the probability that a child of theirs will have blue eyes and hemophilia?

b) What is the probability that a son of theirs will have blue eyes and hemophilia?

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4) A female fruit fly with red eyes is crossed with a male fruit fly with white eyes. What is the probability of a given offspring of this cross being a male with red eyes?

   

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Last updated: Wed, Aug 28, 2002