Q. No.Linkage maps:
1.
always have a total of 100 map units.
2.
can be used to pinpoint the precise physical position of a gene on a chromosome.
3.
are a genetic map based on recombination frequencies.
4.
reflect the frequency of crossing over between X and Y chromosomes.
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Sex-linked recessive traits are more common in males of the species than females. This is because:
| 1. | males are hemizygous for the X chromosome. |
| 2. | male hormones such as testosterone often exacerbate the effects of mutations on the X chromosome. |
| 3. | female hormones such as estrogen often compensate for the effects of mutations on the X. |
| 4. | X chromosomes in males generally have more mutations than X chromosomes in females. |
All progenies of a cross between a tall plant and a short plant are intermediate in size between the two parental plants. When these progenies are allowed to self-pollinate, plants produced followed a normal distribution. This most likely is due to:
| 1. | Overdominance | 2. | Epistasis |
| 3. | Polygenic inheritance | 4. | Incomplete dominance |
A true breeding red striped tree frog is crossed with a true breeding plain green frog. All progeny have red stripes. This is because:
| 1. | Stripes are dominant to plain green coloration. |
| 2. | Striped frogs are camouflaged better. |
| 3. | Plain green frogs are easily predated upon. |
| 4. | Striped frogs are more common. |
A plant breeder is raising many varieties of plants. As a part of the breeding program, he raises pure line varieties by continuous inbreeding over several generations – one with red flowers and another with white flowers. How can Mendel's laws be demonstrated by hybridization between these varieties?
| 1. | Set up a monohybrid cross and determine if your F2 results are predicted by a 3:1 ratio based on the law of segregation. |
| 2. | Set up a dihybrid cross and determine if your F2 results are predicted by a 9:3:3:1 ratio based on the law of independent assortment. |
| 3. | Set a test cross to demonstrate that your traits breed true. |
| 4. | Set up a two-point test cross to demonstrate that your genes are linked. |
Consider three genes: X, Y, and Z. The recombination frequency between X-Y, X-Z, and Y-Z gene pairs was found to be 50%, 25%, and 50%, respectively. What would be the right inference?
| 1. | genes X and Y are on the same chromosome |
| 2. | genes X and Z are on different chromosomes |
| 3. | genes Y and Z are on different chromosomes |
| 4. | All three genes are located on the same chromosome |
The source of any of the genes located on either of the X chromosomes in a female cannot be:
| 1. | Her Mother's Father. | 2. | Her Father's Mother. |
| 3. | Her Mother's Mother. | 4. | Her Father's Father. |
The chromosomal analysis of a human being, phenotypically female, does not show Barr body. This is most likely:
1. Normal condition
2. Turner’s syndrome
3. Meta female
4. Klinefelter’s syndrome
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Which gene pair in Pisumsativum ought to have shown linkage?
1. Violet versus white flower color and green versus yellow pod color
2. Green versus yellow pod color and tall versus dwarf plant height
3. Full versus constricted pods and Green versus yellow pod color
4. Full versus constricted pods and tall versus dwarf plant height
All the following are mechanisms of sex determination in living organisms except:
1. The Z-W system
2. The X-O system
3. The haplo-diploid system
4. The parthenogenetic system
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