Q. No.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.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Assertion : In honey bee, life history shows natural and complete parthenogenesis.
Reason : In honey bee, both drones and workers are parthenogenetically developed.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
A plant, on repeated self pollination, preserves the trait expressed for many generations. Such a plant is said to be:
(1) Panmictic
(2) Homologous
(3) Apomictic
(4) Pure line
The F1 progeny in monohybrid crosses by Mendel resembled:
1. The parent exhibiting dominant trait completely
2. The parent exhibiting recessive trait completely
3. The parent exhibiting dominant trait partly
4. The parent exhibiting recessive trait partly
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
What is the ratio of a typical monohybrid test cross?
(1) 2 : 1
(2) 3 : 1
(3) 1: 2 : 1
(4) 1 : 1
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
The inheritance of flower colour in dog flower and 4’O clock plant exhibits:
1. Complete dominance
2. Incomplete dominance
3. Co-dominance
4. Lethality
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