A : Occasionally mammary glands are functional in males and condition is called gynaecomastia. R : D

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4.Principles of Inheritance and Variation

normal

$A$ : Occasionally mammary glands are functional in males and the condition is called gynaecomastia.

$R$ : Decreased testosterone in later life may also lead to gynaecomastia. It is usually due to perturbation of estrogen to androgen ratio.

Assertion and Reason both are correct and also correct explanation.

Assertion and Reason both are correct but not explanation of assertion.

Assertion is correct, but Reason is incorrect.

Both Assertion and Reason are incorrect.

Solution

Gynaecomastia is the abnormal development of mammary glands case of males.
In later life the fat deposition increases which results in increased secretion of oestrogen. Due to this hormone perturbation, gynaecomastia.

Standard 12

Biology

If somatic cells of a human male contain single barrbody, the genetic composition of the person would be

normal

One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of ${F_2}$ progenies that mutation is found in

normal

(AIPMT-2004)

Heterozygous tall and violet flowered pea plants were selfed and total $512$ seeds are collected. What will be total number of seeds for both heterozygous traits?

normal

Twin is

normal

Barr body in mammals represents

normal

(AIPMT-1995)

$A$ : Occasionally mammary glands are functional in males and the condition is called gynaecomastia. $R$ : Decreased testosterone in later life may also lead to gynaecomastia. It is usually due to perturbation of estrogen to androgen ratio.

Solution

Similar Questions

If somatic cells of a human male contain single barrbody, the genetic composition of the person would be

One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of ${F_2}$ progenies that mutation is found in

Heterozygous tall and violet flowered pea plants were selfed and total $512$ seeds are collected. What will be total number of seeds for both heterozygous traits?

Twin is

Barr body in mammals represents

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$A$ : Occasionally mammary glands are functional in males and the condition is called gynaecomastia.

$R$ : Decreased testosterone in later life may also lead to gynaecomastia. It is usually due to perturbation of estrogen to androgen ratio.