When the two genes in a dihybrid cross are situated on the same chromosome:

(1) The proportion of parental gene combinations was much higher than the non-parental type

(2) The proportion of parental gene combinations was much lesser than the non-parental type.

(3) The propagation of parental gene combinations was equal to the non-parental type

(4) Only recombinants are formed

It is unfortunate that in our society women are blamed for producing female children and have been obstracised and ill-trated because:

(1) The sex is determined by the type of sperm fertilizing the egg.

(2) The sex is determined by the type of egg fertilizing the sperm.

(3) the sex is determined by the hormones produced by the fetus

(4) the sex is determined by the God's Will

A test cross is done to find out

(1) Fitness of an organism

(2) Genotype of a plant expressing dominant phenotype

(3) The suitable parents for a Mendelian Cross

(4) The hidden genotypic ratio of F2 phenotypes

Identify the incorrect statement:

(1) In addition to recombination, mutation is another phenomeonon that leads to variation in DNA.

(2) Chromosomal aberrations are commonly observed in cancer cells.

(3) A classical example of a point mutation is sickle cell anaemia.

(4) Non ionising radiations cannot be mutations. 

Pedigree analysis is resorted to for genetic analysis in humans rather than conventional genetic methods because:

I. Choice matings are not possible

II. Number of progeny is limited

Of the two statements:

(1) Only I is correct

(2) Only II is correct

(3) Both I and II are correct

(4) Both I and II are incorrect

The two alleles of a gene pair are located on:

1. Homologous sites on homologous chromosomes

2. Heterologous sites on homologous chromosomes

3. Homologous sites on heterologous chromosomes

4. Heterologous sites on heretologous chromosomes

Which of the following are correct regarding linked genes?

I. are located near each other on the same chromosome.

II. violate the law of independent assortment

III. segregate together during meiosis

(1) Only I and II

(2) Only I and III

(3) Only II and III

(4) I, II, III

Consider the cross AaBb x AaBb. If the alleles for both genes exhibit complete dominance, what genotypic ratio is expected in the resulting offspring?

1. 1:1:1:1

2. 9:3:3:1

3. 3:6:3:1:2:1

4. 1:2:1:2:4:2:1:2:1

Two phenotypically normal individuals have an affected child. What can we conclude about the parents?

1. they both carried the diesease allele

2. they are not the parents of the child

3. they are affected

4. no conclusions can be drawn

What is the basis of pleiotropy?

1. A spontaneous mutation during the replication of DNA.

2. Interrelationship between various metabolic pathways in the body.

3. Chromosomal aberration as chromosomes are the vehicles of genes.

4. the behaviour of chromosomes during meiosis or gamete formation.