Q. No.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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A recessive pattern of inheritance can be easily identified in a pedigree analysis if it shows that:
| 1. | Two affected individuals have three affected children. |
| 2. | Two unaffected individuals have one affected and two unaffected children. |
| 3. | There are four instances where at least one affected parent has an affected child. |
| 4. | Two known heterozygotes have two affected and one unaffected child. |
Pedigree analysis rather than conventional methods are used to study genetic traits because:
| I: | Number of progeny is limited |
| II: | Choice matings are not possible |
| III: | Sexual dimorphism is seen in humans |
1. I only
2. II only
3. III only
4. Both I and II
A true breeding (pure line) plant can be differentiated from a hybrid as:
1. They only have one type of allele of the gene that controls the trait of interest.
2. They carry two different alleles for the gene that controls the trait of interest.
3. They can only reproduce by self fertilization.
4. They all have dominant alleles for the trait of interest.
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