Two crosses between the same pair of genotypes/phenotypes in which the sources of gametes are reversed in one cross are called
1. Test cross
2. Reverse cross
3. Dihybrid cross
4. Reciprocal cross

When a cluster of genes show linkage behaviour, they:

Linkage map of X-chromosome of fruitfly has 66 map units with yellow body gene(y) at one end & bobbed hair (b) at the other. The recombination frequency between y and b gene would be
1. 66%
2. > 50%
3. 50%
4. 100%

A harmful condition which is also a potential saviour from a mosquito borne infectious disease
1. Thalassemia
2. Sickle cell anaemia
3. Leukemia
4. Pernicious anaemia

Genetic map is one that
1. Establishes sites of the gene on a chromosome
2. Establishes the various stages in gene evolution
3. Shows the stages during cell division
4. Shows distribution of various species in a region

One of the genes present exclusively on the X-chromosome in humans is concerned with
1. Baldness
2. Red-green color blindness
3. Facial hair/moustaches in males
4. Night blindness

Self fertilising trihybrid plants form
1.Eight different gametes and 64 different zygotes
2. Four different gametes and sixteen different zygotes
3. Eight different gametes and sixteen different zygotes
4. Eight different gametes and thirty two different zygotes

A mutation at a gene locus changes a character due to change in
1. DNA replication
2. Protein synthesis pattern
3. RNA transcription pattern
4. Protein structure

A normal woman whose father was colour blind is married to normal visioned man. Their sons would be
1. 75% colour blind
2. 50% colour blind
3. 100% colour blind
4. All normal.

In a plant, red fruit (R) is dominant over yellow fruit (r), and tallness (T) is dominant over shortness (t). A plant with RRTt genotype is crossed with a plant of rrtt genotype. The progeny is:
1. All red fruit, tall 25%
2. All red fruit, tall 50%
3. All red fruit and tall 75%
4. All red fruit and tall.