Genetics

Genetics - EXAM I GENE(BIOL)3200 January 26, 2010 Dr....

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EXAM I GENE(BIOL)3200 January 26, 2010 Dr. Condie Initials ____________________ Last 5 digits of 810 number ___________________ 1 KEYKEYKEYKEYKEYKEYKEYKEYKEYKEYKEYKEYKEYKEY .(points) The chromosomal theory of inheritance states that: A. chromosomes replicate before cell division. B. alleles of a gene segregate during cell division. C. chromosomes are made of DNA. D. genes are located on chromosomes. E. X chromosomes are inactivated. . (points) Nondisjunction can occur at either the first or second division of meiosis. XYY individuals would most likely arise from nondisjunction at the ______ meiotic division in the ______. A. first, mother B. second, mother C. first, father D. second, father E. More than one of the choices could give rise to XYY individuals. . ( points) If two genes are tightly linked, such that no crossing over occurs between them then _________________________________. A. all progeny will be recombinants. B. all progeny will be parentals. C. progeny will be 50% parental, 50% nonparental. D. all progeny will be nonparentals. E. progeny will be 25% nonrecombinant, 75% recombinant. (points) Which of the following statements best describes a null allele? A. Its an allele that generates more protein than the wild type allele. B. It completely lacks any function. C. It has acquired a new function in addition to its normal functions. D. It interferes with the function of the wild type protein in heterozygotes. E. It has lost some but not all of its normal function.
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EXAM I GENE(BIOL)3200 January 26, 2010 Dr. Condie Initials ____________________ Last 5 digits of 810 number ___________________ 2 .(points) Crossing over between homologous chromosomes occurs at which of the following stages of meiosis? A. S phase B. prophase I C. metaphase I D. anaphase I E. prophase II .(points) The diploid cell formed by the fertilization of the egg by the sperm during sexual reproduction is a(n) A. reciprocal. B. zygote. C. dihybrid. D. gamete. E. monohybrids. . (points) If two or more forms of the same gene exist, the different forms are called A. incomplete dominance. B. penetrance and expressivity. C. pleiotropic. D. alleles. E. dihybrid. . (points) In the dihybrid cross AaBb × aabb where the A and B genes are unliked, what proportion of homozygotes is expected among the F 1 offspring? A. 1/4 B. 1/2 C. 3/4 D. All are homozygotes. E. None are homozygotes. (points) When a pea plant of genotype Aa Bb produces gametes what proportion will be Ab? Assume that the two genes assort independently. A. 1/4 B. 1/2 C. 9/16 D. 3/4 E. None
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EXAM I GENE(BIOL)3200 January 26, 2010 Dr. Condie Initials ____________________ Last 5 digits of 810 number ___________________ 3 . (2 points) A trait which is caused by an allele that acts as a dominant allele in men but as a recessive allele in women, is a(n) _________ trait. A.
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Genetics - EXAM I GENE(BIOL)3200 January 26, 2010 Dr....

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