1. Three alleles exist for coat color in rabbits: Cp, Ct, and Cz. A male Cp/Cz i

Question

1. Three alleles exist for coat color in rabbits: Cp, Ct, and Cz. A male Cp/Cz is crossed with a female Ct/Ct. Occasionally some rare genotypes occur. For each of the following rare genotypes, explain how they occurred: state which meiotic stage nondisjunction occurred and in which parent (male vs. female) the event occurred (example: female meiosis I). What caused the following rare genotype: Cp/Cz/Ct

2. Three alleles exist for coat color in rabbits: Cp, Ct, and Cz. A male Cp/Cz is crossed with a female Ct/Ct. Occasionally some rare genotypes occur. For each of the following rare genotypes, explain how they occurred: state which meiotic stage nondisjunction occurred and in which parent (male vs. female) the event occurred (example: female meiosis I). What caused the following rare genotype: Cp/Cp/Ct

3. Three alleles exist for coat color in rabbits: Cp, Ct, and Cz. A male Cp/Cz is crossed with a female Ct/Ct. Occasionally some rare genotypes occur. For each of the following rare genotypes, explain how they occurred: state which meiotic stage nondisjunction occurred and in which parent (male vs. female) the event occurred (example: female meiosis I). What caused the following rare genotype: Ct

4. The mixing of the B. oleracea genome with the B. campestris genome to create the B. napus species is an example of:

5. A mutation that results in an AT pair becoming a CG pair (A>C) is an example of a:

6. Turner syndrome (XO) is an example of a  while Kleinfelter syndrome (XXY) is an example of a

7. If resistance to a certain chemical is recessive, screening for resistance is easier to do if the organism is:

Explanation / Answer

1. Complete non-disjunction in meiosis I produces cells with alleles Cp-Cp/Cz-Cz which in turn produce Cp, Cp gametes in meiosis II and in meiosis I. But non-disjunction in meiosis II would produce male gametes with alleles Cp-Cp. It's fusion with female gametes result in cells with Cp, Cp, Ct alleles. So, non-disjunction in meiosis I and meiosis II can lead to the abnormal phenotypes.

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