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Few Biology questions for review I dont understand.

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    1. Individuals that were homozygous dominant for genes C and E were crossed with homozygous recessives, and the F1 generation was test-crossed. Given the following chromosome map, if there were 500 offspring from this test cross, how many would you predict would be recombinant?

    C___________D__________________E ________________________________ _____F
    4 6 10
    A. 25 C. 50
    B. 40 D. 100




    2. The gene M is essential for life. In a cross PpMm x PpMm, the number of offspring out of 16 which will not survive is:
    A. 12 C) 4
    B. 9 D. 3



    3. Two parents were known to be right-handed. Assuming that right-handed (R) is dominant to left-handed (r), what would be the genotypes of the parents if their son is left-handed?
    A. rr x rr C. RR x rr
    B. Rr x Rr D. rr x Rr


    4. Familial intestinal polyposis results in multiple finger-like growths (polyps) from the lining of the large intestine. It is inherited as a dominant trait. Let P represent the allele producing the polyps and p represent the normal allele. One parent is heterozygous and the other is homozygous recessive. If the couple has four children, how many would be expected to have the familial intestinal polyposis phenotype?
    A) 1 C) 3
    B) 2 D) 4



    Thanks in advance for the help .
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Updated: April 23, 2012
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