1.) In tomato plants, spines (s) are recessive to nospines (S), and white fruit color (w) isrecessive to red fruit color (W). The genes for spines andfruit color are located on the same chromosome; findings frommapping experiments indicate that they are 13.2 m.u. apart. Atomato plant having spines and white fruit color is crossed with aplant that is homozygous for no spines and red fruit color. The F1are crossed with plants that have spines and white fruit color.Which of the following phenotypes and proportions are expected inthe progeny of this cross? Check all that apply.
a) Red, no spines = 43.4%; white, spines = 43.4%
b) White, no spines = 43.4%; red, spines = 43.4%
c) Red, no spines = 6.6%; red, spines = 6.6%
d) White, no spines = 6.6%; white, spines = 6.6%
e) White, no spines = 6.6%; red, spines = 6.6%
f) Red, no spines = 43.4%; red, spines = 43.4%
g) Red, no spines = 6.6%; white, spines = 6.6%
h) White, no spines = 43.4%; white, spines = 43.4%
2.) In Drosophila, the map positions of genes are givenin map units numbering from one end of a chromosome to the other.The X chromosome of Drosophila is 66 m.u. long.The X-linked gene for body color-with two alleles,y +for gray body and y foryellow body-resides at one end of the chromosome at map position0.0. A nearby locus controlling bristle form, withf +for normal bristles and ffor forked bristles is located at map position 1.5. A thirdX-linked gene for eye color, with alleles w+for red eye and w for white eye, islocated at map position 56.7. Each gene resides on the Xchromosome, and at each locus the wild-type allele is dominant overthe mutant allele. Do you expect any of these gene pair(s) toassort independently?
a) Yes, y and w are each expected to assortindependently of f
b) Yes, all the genes are expected to assort independently
c) Yes, y and f are each expected to assortindependently of w
d) No, there are no genes expected to assortindependently
1.) In tomato plants, spines (s) are recessive to nospines (S), and white fruit color (w) isrecessive to red fruit color (W). The genes for spines andfruit color are located on the same chromosome; findings frommapping experiments indicate that they are 13.2 m.u. apart. Atomato plant having spines and white fruit color is crossed with aplant that is homozygous for no spines and red fruit color. The F1are crossed with plants that have spines and white fruit color.Which of the following phenotypes and proportions are expected inthe progeny of this cross? Check all that apply.
a) Red, no spines = 43.4%; white, spines = 43.4%
b) White, no spines = 43.4%; red, spines = 43.4%
c) Red, no spines = 6.6%; red, spines = 6.6%
d) White, no spines = 6.6%; white, spines = 6.6%
e) White, no spines = 6.6%; red, spines = 6.6%
f) Red, no spines = 43.4%; red, spines = 43.4%
g) Red, no spines = 6.6%; white, spines = 6.6%
h) White, no spines = 43.4%; white, spines = 43.4%
2.) In Drosophila, the map positions of genes are givenin map units numbering from one end of a chromosome to the other.The X chromosome of Drosophila is 66 m.u. long.The X-linked gene for body color-with two alleles,y +for gray body and y foryellow body-resides at one end of the chromosome at map position0.0. A nearby locus controlling bristle form, withf +for normal bristles and ffor forked bristles is located at map position 1.5. A thirdX-linked gene for eye color, with alleles w+for red eye and w for white eye, islocated at map position 56.7. Each gene resides on the Xchromosome, and at each locus the wild-type allele is dominant overthe mutant allele. Do you expect any of these gene pair(s) toassort independently?
a) Yes, y and w are each expected to assortindependently of f
b) Yes, all the genes are expected to assort independently
c) Yes, y and f are each expected to assortindependently of w
d) No, there are no genes expected to assortindependently
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Related questions
In Drosophila, the map positions of genes are given in map units numbering from one end of a chromosome to the other. The X chromosome of Drosophila is 66 m.u.. long. The X-linked gene for body color-with two alleles, y +for gray body and y for yellow body-resides at one end of the chromosome at map position 0.0. A nearby locus for eye color, with alleles w +for red eye and w for white eye, is located at map position 1.5. A third X-linked gene, controlling bristle form, with f + for normal bristles and f for forked bristles, is located at map position 56.7. Each gene resides on the Xchromosome, and at each locus the wild-type allele is dominant over the mutant allele.
Predict the frequency of gray with white eyes and forked bristles progeny type produced by this mating.
Enter your answer as a percentage to three decimal places (example 0.235 or 0.230).
Frequency=_________
2.
| Phenotype | Number |
| Pale | 648 |
| Pale, oval | 64 |
| Pale, short | 10 |
| Pale, oval, short | 102 |
| Oval | 6 |
| Oval, short | 618 |
| Short | 84 |
| Wild type | 98 |
| 1630 |
A wild-type trihybrid soybean plant is crossed to a pure-breeding soybean plant with the recessive phenotypes pale leaf l, oval seed (r), and short height (t). The results of the three-point test cross are shown in the table. Traits not listed are wild type.
Calculate the interference value for these data.
Enter your answer to three decimal places (example 0.201).
Please show detailed work. Thanks in advance.
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
