Term
| How and at what stage do chromosomes undergo independent assortment? |
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Definition
a. meiosis I pairing of homologs
b. meiosis II separation of homologs
c. meiosis I metaphase alignment
d. meiosis I telophase separation |
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Term
| Which of the following is an example of "recombinant DNA technology?" |
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Definition
A. combining alternate alleles of a gene in a single cell
B. manipulating a meiotic crossing-over event
C. cloning genes from homologous pairs of chromosomes
D. introducing a human gene into a bacterial plasmid
E. alternate alleles assorting independently |
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Term
| Which of the following DNA molecules is most likely to be cut by a restriction enzyme? |
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Definition
A. 5′-AAGCCT-3′
B. 5′-GGAAGG-3′
C. 5′-GGATCC-3′
D. 5′-AATTAA-3′ |
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Term
| Albinism in humans occurs when both alleles at a locus produce defective enzymes in the biochemical pathway leading to melanin. Given that heterozygotes are normally pigmented, which of the following statements is/are correct? |
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Definition
A. One normal allele produces as much melanin as two normal alleles.
B. Each defective allele produces a little bit of melanin.
C. Two normal alleles are needed for normal melanin production.
D. The two alleles are codominant.
E. The amount of sunlight will not affect skin color of heterozygotes. |
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Term
| Imagine a genetic counselor working with a couple who have just had a child who is suffering from Tay-Sachs disease. Neither parent has Tay-Sachs, nor does anyone in their families. Which of the following statements should this counselor make to this couple? |
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Definition
A. “Because no one in either of your families has Tay-Sachs, you are not likely to have another baby with Tay-Sachs. You can safely have another child.”
B. “Because you have had one child with Tay-Sachs, you must each carry the allele. Any child you have has a 50% chance of having the disease.”
C. “Because you have had one child with Tay-Sachs, you must each carry the allele. Any child you have has a 25% chance of having the disease.”
D. “Because you have had one child with Tay-Sachs, you must both carry the allele. However, since the chance of having an affected child is 25%, you may safely have thee more children without worrying about having another child with Tay-Sachs.”
E. “You must both be tested to see who is a carrier of the Tay-Sachs allele.” |
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Term
| Roan cattle have red hairs and white hairs because of codominance of two alleles. Cross a roan cow with a red bull and give the phenotypic ratio. |
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Definition
A. 1:1 roan
B. ½ roan: ½ red
C. ¾ roan: ¼ red
D. 1:1 red |
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Term
| In recombinant DNA methods, the term vector refers to |
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Definition
A. the enzyme that cuts DNA into restriction fragments
B. the sticky end of a DNA fragment
C. a plasmid used to transfer DNA into a living cell
D. the host that receives the recombinant DNA |
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Term
| During asexual reproduction, the genetic material of the parent is passed on to the offspring by |
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Definition
A. homologous pairing.
B. meiosis and fertilization.
C. mitosis and cytokinesis.
D. meiosis and cytokinesis. |
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Term
| If an individual is homozygous for type B blood and they marry a heterozygous type A individual, what is the chance that their first child will have type AB blood? |
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Definition
a. 0%
b. 25%
c. 50%
d. 75% |
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Term
| Small accessory DNA found in bacteria and useful in recombinant DNA procedures are called: |
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Definition
A. Plasmids
B. Palindromes
C. Centrioles
D. Bacteriophage |
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Term
| The enzymes used to cut genes in recombinant DNA research are called: |
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Definition
A. DNA polymerases
B. RNA polymerases
C. Replicases
D. Restriction enzymes |
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Term
| During which stage of mitosis do sister chromatids move away from each other? |
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Definition
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase |
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Term
| Diploid cells of the fruit fly Drosophila have 10 chromosomes. How many chromosomes does a Drosophila gamete have? |
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Definition
A. one
B. two
C. five
D. ten |
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Term
| During which stage of mitosis do sister chromatids move away from each other? |
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Definition
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase |
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Term
| The products of meiosis are: |
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Definition
A. one nucleus containing twice as much DNA as the parent nucleus.
B. two genetically identical cells.
C. four nuclei containing half as much DNA as the parent nucleus.
D. four genetically identical nuclei. |
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Term
| In tigers, a recessive allele causes an absence of fur pigmentation, a white tiger. If two phenotypically normal tigers that are heterozygous for this gene are mated, what percentage of their offspring will be white? |
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Definition
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Term
| Bar eye in Drosphila is an X-linked characteristic in which bar eye (B) is dominant over nonbar-eye (b). What is the genotype of a nonbar-eyed female and a bar-eyed male? |
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Definition
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Term
| This segment of DNA is cut at restriction sites 1 and 2, which creates restriction fragments A, B, and C. Which of the following electrophoretic gels represents the separation of these fragments? |
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Definition
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