(C) In humans,males are $XY$ and females are $XX$. Since males have only one $X$ chromosome,any recessive gene present on the $X$ chromosome will be e

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(C) In humans,males are $XY$ and females are $XX$. Since males have only one $X$ chromosome,any recessive gene present on the $X$ chromosome will be expressed because there is no corresponding allele on the $Y$ chromosome to mask its effect. This condition is known as hemizygous. Therefore,a single recessive gene on the $X$ chromosome of a male is sufficient to express the trait.

Class 12 Biology Principles of Inheritance and Variation Sex determination

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Usually,the recessive character is expressed only when present in a double recessive condition. However,a single recessive gene can express itself in human beings when the gene is present on

AIIMS 1983 All AIIMS

AIIMS 1992 All AIIMS

A
Any autosome
B
$X$ chromosome of female
C
$X$ chromosome of male
D
Either on autosome or $X$ chromosome

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Principles of Inheritance and Variation

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Sex determination

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The genic balance theory of sex determination in $Drosophila$ was proposed by:

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$(a)$ In humans,males are heterogametic and females are homogametic. Explain. Are there any examples where males are homogametic and females heterogametic?
$(b)$ Also describe as to who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.

Medium

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$A$ diseased man marries a normal woman. They get three daughters and five sons. All the daughters were diseased and sons were normal. The gene of this disease is

MediumAIPMT 2002

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In the male heterogametic type of sex determination:

EasyKCET 2023

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Gynandromorphs develop in Drosophila when the two cells in the two-celled proembryo have one of the following chromosomal sets:

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Usually,the recessive character is expressed only when present in a double recessive condition. However,a single recessive gene can express itself in human beings when the gene is present on

Similar Questions

The genic balance theory of sex determination in $Drosophila$ was proposed by:

$(a)$ In humans,males are heterogametic and females are homogametic. Explain. Are there any examples where males are homogametic and females heterogametic?$(b)$ Also describe as to who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.

$A$ diseased man marries a normal woman. They get three daughters and five sons. All the daughters were diseased and sons were normal. The gene of this disease is

In the male heterogametic type of sex determination:

Gynandromorphs develop in Drosophila when the two cells in the two-celled proembryo have one of the following chromosomal sets:

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$(a)$ In humans,males are heterogametic and females are homogametic. Explain. Are there any examples where males are homogametic and females heterogametic?
$(b)$ Also describe as to who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.