Which of the four couples claiming the baby O positive blood type are possible biological parents of it?

a. B- and O-

b. O+ and AB+

c. AB+ and AB-

d.A+ and O-

If two people who are carrier for a genetically inherited fatal recessive disease decide to marry and disease cause still birth. What is the probability of the live children to be a carrier?

a.1/2

b.2/3

c.1/4

d.1/3

Assertion : Phenylketonuria is a recessive hereditary disease caused by the body’s failure to oxidize an amino acid phenylalanine to tyrosine, because of a defective enzyme.

Reason : It results in the presence of phenylalanine acid in the urine.

Assertion   :       In honey bee, life history shows natural and complete parthenogenesis.

Reason      :       In honey bee, both drones and workers are parthenogenetically developed.

A plant, on repeated self pollination, preserves the trait expressed for many generations. Such a plant is said to be:

The F1 progeny in monohybrid crosses by Mendel resembled:

In a true breeding the allelic pair of genes are

1. Homologous
2. Linked
3. Stable
4. Homozygous

A test cross is done to find out:

What is the ratio of a typical monohybrid test cross?

The law of Segregation is based on the fact that

1. The alleles do not show any blending

2. There is random fertilization

3. Gametes are pure for the trait

4. The zygotes are diploid