In Drosophila, the sex is determined by:
1. | The ratio of the number of X-chromosomes to the sets of autosomes |
2. | X and Y chromosomes |
3. | The ratio of pairs of X-chromosomes to the pairs of autosomes |
4. | Whether the egg is fertilized or develops parthenogenetically |
A genetic map is one that:
1. Establishes sites of the genes on a chromosome
2. Establishes the various stages in gene evolution
3. Shows the stages during the cell division
4. Shows the distribution of various species in a region
Independent assortment of genes does not take place when:
1. | Genes are located on homologous chromosomes |
2. | Genes are linked and located on the same chromosome |
3. | Genes are located on non-homologous chromosome |
4. | All the above |
Mendel obtained wrinkled seeds in peas due to the deposition of sugars instead of starch. It was due to which enzyme:
1. Amylase
2. Invertase
3. Diastase
4. Absence of starch branching enzyme
The ratio of complementary genes is:
1. 9 : 3 : 4
2. 12 : 3 : 1
3. 9 : 3 : 3 : 4
4. 9 : 7
When dominant and recessive alleles express themselves together it is called:
1. Co-dominance
2. Dominance
3. Amphidominance
4. Pseudo dominance
A and B genes are linked. What shall be the genotype of progeny in a cross between AB/ab and ab/ab:
1. AAbb and aabb
2. AaBb and aabb
3. AABB and aabb
4. None
Which statement is correct about the centre of origin of the plant:
1. More diversity in an improved variety
2. Frequency of the dominant gene is more
3. Climatic conditions more favourable
4. None
The probability of four sons to a couple is:
1. | 1/4 | 2. | 1/8 |
3. | 1/16 | 4. | 1/32 |
Two nonallelic genes produce the new phenotype when present together but fail to do so independently then it is called:
1. Epistasis
2. Polygene
3. Non-complimentary gene
4. Complimentary gene