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A diseased man marries a normal woman. They have three daughters and five sons. All the daughters were diseased and sons were normal. What is the gene of this disease?

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Important Questions on Principles of Inheritance and Variation

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Biology Crash Course NEET>Chapter 27 - Principles of Inheritance and Variation>Level 2>Q 80
Female Question Image AB Ab aB ab
gametes ? AaBB AaBb aaBB aaBb

In the Punnet square given above, the genotype of the female parent and male parents respectively:

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Biology Crash Course NEET>Chapter 27 - Principles of Inheritance and Variation>Level 2>Q 82
Which of the four couples claiming the baby with O+ blood type are possibly the biological parents of it?
EASY
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Biology Crash Course NEET>Chapter 27 - Principles of Inheritance and Variation>Level 2>Q 83
In human beings, the color of skin is controlled by
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IMPORTANT
Biology Crash Course NEET>Chapter 27 - Principles of Inheritance and Variation>Level 2>Q 84
Statement-1: Phenylketonuria is a recessive hereditary disease caused by the body’s failure to oxidize amino acid phenylalanine to tyrosine, because of deficiency of an enzyme.

Statement-2: It results in the presence of phenylalanine and its acid derivative in urine.
HARD
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IMPORTANT
Biology Crash Course NEET>Chapter 27 - Principles of Inheritance and Variation>Level 2>Q 85
A husband and wife have normal vision, although both of their fathers are red-green colour blind, which is inherited as an x-linked recessive trait.

What is the probability that their first child will be?

i. A normal son.

ii. A carrier daughter.

iii. A colour-blind son.

iv. A colour-blind daughter.
EASY
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Biology Crash Course NEET>Chapter 27 - Principles of Inheritance and Variation>Level 2>Q 86
Sickle cell anaemia is caused by
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Biology Crash Course NEET>Chapter 27 - Principles of Inheritance and Variation>Level 2>Q 87
If two pea plants having red (dominant) coloured flowers with unknown genotypes are crossed, 75% of the flowers are red and 25% are white. The
genotypic constitution of the parents having red coloured flowers will be :-
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Biology Crash Course NEET>Chapter 27 - Principles of Inheritance and Variation>Level 2>Q 89
If enough crosses are made between male flies of the genotype 'Aa' and the female flies of the genotype 'aa' to produce about 1000 offsprings. Which one of the following is the most likely distribution of genotypes in the offsprings?