The allele for detached earlobes is dominant to the allele for attached earlobes.Two parents are heterozygous for detached earlobes. What is the probability of their first child having attached earlobes?

INHERITANCE AND VARIATION

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	0%
B	25%
C	50%
D	75%

Explanation:

Detailed explanation-1: -Solution : The cross between two heterozygous will give the phenotypic ratio of 3 detached : 1 attached earlobe. The probability of their first child having attached earlobes will be 25%.

Detailed explanation-2: -Final answer: There is a 25% chance that the next child will have attached earlobes.

Detailed explanation-3: -A single autosomal gene with two alleles determines whether you have attached earlobes or free-hanging earlobes. The allele for free-hanging earlobes (F) is dominant to the allele for attached earlobes (f). Other single-gene autosomal traits include widow’s peak and hitchhiker’s thumb.

Detailed explanation-4: -The probability of having offspring with free earlobes then is 3/4; for attached earlobes, it is 1/4.

There is 1 question to complete.

NEET BIOLOGY

GENETICS AND EVOLUTION

INHERITANCE AND VARIATION