What map unit (Centimorgan) is adopted in the construction of genetic maps?

1.	A unit of distance between genes on chromosomes, representing 50% cross-over.
2.	A unit of distance between two expressed genes, representing 10% cross-over.
3.	A unit of distance between two expressed genes, representing 100% cross-over.
4.	A unit of distance between genes on chromosomes. representing 1% cross-over.

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by:

What is the genetic disorder in which an individual has an overall masculine development gynaecomastia, and is sterile?

Assertion: Dominance is not always an autonomous feature of gene or its product.

Reason: Occasionally a single gene product may produce more than one effects.

A heterozygous plant produces:
1. Only one kind of gamete

2. Two kinds of gametes each having one allele with equal proportion.

3. Two kinds of gametes each having two alleles with equal proportion.

4. Two kinds of gametes each having one allele with one allele occurring in more gametes than the other.

What is the F₂ phenotypic ratio in cases of incomplete dominance?
1. 1 : 1

2. 3 : 1

3. 1 : 2 : 1

4. 1 : 1

Occasionally, a single gene product may produce more than one effect. Such a gene is said to be:
1. Pleiotropic

2. Polygenic

3. Psuedoallele

4. Housekeeping

‘When two pairs of traits are combined in a hybrid, segregation of one pair of characters is independent of the other pair of characters’. This is the statement of:

1. Law of Dominance

2. Law of segregation

3. Law of Independent Assortment

4. Law of Linkage

Mendelian disorders are mainly determined by:
1. Alteration or mutation in a single gene.
2. Chromosomal gross structural changes.
3. Recombination between linked genes.
4. Jumping genes

The point mutation leading to sickle cell anaemia occurs:

1. at sixth position in the beta chain of haemoglobin
2. at sixth position in the alpha chain of haemoglobin
3. at sixth position in the beta chain of myoglobin
4. at sixth position in the alpha chain of myoglobin