Q. No.
Heterozygotes for cystic fibrosis had a survival advantage during plague epidemics. This can be explained by
1. Multiple alleles
2. Overdominance
3. Environmental influence
4. Epistasis
Which field of genetics is the oldest?
1. Transmission genetics.
2. Molecular genetics.
3. Population genetics.
4. Developmental genetics.
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
The consequences of F factor mediated conjugation in bacteria is:
1. both strains are F+.
2. transfer of complete bacterial chromosome.
3. conversion of the recipient strain to F+ and the donor to F-.
4. both strains are F-
With successive divisions, the telomeres get shortened. This is explained by the fact that
1. Only pieces of DNA with centromeres are correctly sorted into daughter nuclei during mitosis.
2. Only pieces of DNA with telomeres are correctly sorted into daughter nuclei during mitosis.
3. This piece of DNA is recognized as foreign by the cell.
4. 1 and 2.
All the following regarding maternal effect genes are true except
1. It is located in the nuclear DNA.
2. Maternal genotype affects offspring phenotype.
3. It may control deposition of material into oocytes.
4. It must be located on the X chromosome.
The gene for the enzyme Phenylalanine hydroxylase is located on chromosome:
1. 7
2. 11
3. 12
4. X
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Mendel’s Law of independent assortment holds good for genes situated on the:
1. non-homologous chromosomes
2. homologous chromosomes
3. extra nuclear genetic element
4. same chromosome
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Resistance to sudden death is a dominant trait in soybeans. Two parent plants that are resistant to sudden death produce a progeny that is not resistant, but this progeny can pass the trait to its progeny in the next generation. This unusual pattern can be explained by?
1. Overdominance
2. Incomplete penetrance
3. Incomplete dominance
4. Variable expressivity
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