Q. No.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
The trait shown in the given pedigree chart is most likely a/an:
1. Autosomal recessive trait
2. Autosomal dominant trait
3. Sex linked recessive trait
4. Sex linked dominant trait
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.
A female whose father was colorblind marries and normal male whose father was also colorblind. What is the probablility that their daughter will be colorblind?
1. 0 %
2. 25 %
3. 50 %
4. 75 %
In humans, the dominance relationship between the A and B alleles of ABO blood group gene is an example of
(1) complete dominance.
(2) incomplete dominance.
(3) codominance.
(3) epistasis
One of the Mendel's pure strains of pea plants had green peas. How many different types of eggs could such a plant produce with regard to pea color?
1. 1
2. 2
3. 4
4. 8
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