BIO SCI 97 Lecture Notes - Lecture 28: Synteny, Gamete, Meiosis
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16. Syntenic genes can assort independently when
A) they are very close together on a chromosome.
B) they are located on different chromosomes.
C) crossing over occurs rarely between the genes.
D) they are far apart on a chromosome and crossing over occurs frequently between the genes.
E) they are far apart on a chromosome and crossing over occurs very rarely between the genes.
17. The alleles of linked genes tend to
A) segregate together more often than expected by random assortment
B) assort independently.
C) be mutated more often than unlinked genes.
D) experience a higher rate of crossing over.
E) assort independently and show a higher rate of crossing over.
18. If you know that the frequency of recombination between genes X and Y is 34% and between X and Z is 25%, can you predict the order of the three genes?
A) Yes; the order is X-Z-Y.
B) Yes; the order is X-Y-Z.
C) Yes; the order is Z-X-Y.
D) No; based on this data alone, the order could be Z-Y-X or X-Y-Z.
E) No; based on this data alone, the order could be X-Z-Y or Z-X-Y.
Question 19 - 20. You have performed the following dihybrid cross in Drosophila using the black body color (b) and vestigial wing (vg) mutations. The b+ (grey body) and vg+ (normal wing) are dominant wild type alleles. These genes are autosomal.
Female â b+ vg+/b vg à male â b vg/b vg
Progeny:
Phenotype # of Progeny
Grey body normal wing 965
Black body vestigial wing 944
Grey body vestigial wing 208
Black body normal wing 195
19. Assuming linkage between black and vestigial, the estimated recombination frequency would be:
0.17
0.09
0.82
1.00
0.50
20. What key test could you use to determine whether the observed offspring frequencies deviate from those expected by chance alone?
A) Pascal's triangle
B) The product rule
C) The Chi-square (Ï2) test
D) The law of random assortment
E) The sum rule
21. In a genome wide association study (GWAS) designed to map the gene(s) that control height you divide subjects into a group of 1000 who are all more than seven feet tall and a control group of 1000 people of average height. You find the following associations between two genetic markers and the height trait:
Tall group | Control group | ||
Marker 1 | Allele A | 20% | 50% |
Allele T | 80% | 50% | |
Marker 2 | Allele G | 15% | 15% |
Allele C | 85% | 85% |
What is your best guess for which marker is more closely linked to a gene that influences height?
A) Marker 1
B) Marker 2
22. Two pure breeding parents produce red and white flowers. They are crossed and the F1 produces pink flowers. When the F1 are selfed to produce the F2, nine distinct classes of pigmentation are present among F2 individuals. What is your best guess of the minimum number of genes that underlie flower pigmentation in this species?
A. 2
B. 3
C. 4
D. 5
E. 6
23. In a quantitative genetic experiment you identify two genes that confer bands of color on the back of a fly. At each gene, a dominant allele causes one band of color. If flies that are heterozygous at both loci are crossed, what ratio of offspring do you expect in each phenotype (i.e., number of color bands) class? (answer options are given from lowest to highest band number)
A) 1:1:1:1:1
B) 1:2:2:2:1
C) 1:4:6:4:1
D) 4:4:4:4:4
Yellow seeds on a pea plant are an example of a/an ______.
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A plant that produces white flowers is crossed to a plant that produces orange flowers. All of the offspring produced white flowers. What can you conclude?
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Question 42 (1 point)
What units are bonded together to make a strand of DNA?
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Question 43 (1 point)
Many modern-day trees are tall because ______.
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Question 44 (1 point)
An organismâs phenotype includes ______.
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Question 45 (1 point)
Which of these is a correct order of taxonomic categories from less specific to more specific?
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Question 46 (1 point)
In the scientific name of humans, Homo sapiens, the name âsapiensâ is the ______.
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Question 47 (1 point)
Cells occur singly and have a nucleus and other organelles, including chloroplasts. These cells move with flagella. They are ______.
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Question 48 (1 point)
Cilia are ______.
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Question 49 (1 point)
The state of having more than two full sets of chromosomes is called ______.
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Question 50 (1 point)
Which of the following occurs in mitosis but NOT in meiosis?
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Yellow seeds on a pea plant are an example of a/an ______.
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