(C) According to the British geneticist Mary Lyon $(1961)$,one of the two $X$-chromosomes of a normal female becomes heterochromatic and appears as a

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(C) According to the British geneticist Mary Lyon $(1961)$,one of the two $X$-chromosomes of a normal female becomes heterochromatic and appears as a Barr body. This phenomenon is known as Lyonization or $X$-inactivation. Therefore,Barr bodies are associated with the female sex chromosome.

Class 12 Biology Principles of Inheritance and Variation Sex determination

Medium

Barr bodies (seen in saliva test in Olympic games) are found in humans and are associated with:

AIPMT 1992 All AIPMT

A
Male autosome
B
Female autosome
C
Female sex chromosome
D
Male sex chromosome

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Class 12 Questions

Class 12

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Chapter

Principles of Inheritance and Variation

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Sex determination

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AIPMT 1992 Paper All AIPMT years →

$A$: Non-allosomic genic determination of sex is found in bacteria.
$R$: Sex is dependent on some environmental factors in prokaryotes.

Medium

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The theory where the ratio between the number of $X$-chromosomes and the number of complete sets of autosomes determines the sex is known as:

Medium

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Match the following columns:
Column-$I$ Column-$II$
$(P)$ $(X+O)$ $(i)$ Genetic constitution in Drosophila
$(Q)$ $(XX+XY)$ $(ii)$ Genetic constitution in grasshopper
$(R)$ $(ZZ+ZW)$ $(iii)$ Sex determination in birds
$(S)$ $(AA+XX)$ $(iv)$ Sex determination in humans

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Describe the haplo-diploid sex determination system.

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$A$ hereditary disease which is never passed on from father to son is

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Column-$I$	Column-$II$
$(P)$ $(X+O)$	$(i)$ Genetic constitution in Drosophila
$(Q)$ $(XX+XY)$	$(ii)$ Genetic constitution in grasshopper
$(R)$ $(ZZ+ZW)$	$(iii)$ Sex determination in birds
$(S)$ $(AA+XX)$	$(iv)$ Sex determination in humans

Barr bodies (seen in saliva test in Olympic games) are found in humans and are associated with:

Similar Questions

$A$: Non-allosomic genic determination of sex is found in bacteria.$R$: Sex is dependent on some environmental factors in prokaryotes.

The theory where the ratio between the number of $X$-chromosomes and the number of complete sets of autosomes determines the sex is known as:

Match the following columns:Column-$I$Column-$II$$(P)$ $(X+O)$$(i)$ Genetic constitution in Drosophila$(Q)$ $(XX+XY)$$(ii)$ Genetic constitution in grasshopper$(R)$ $(ZZ+ZW)$$(iii)$ Sex determination in birds$(S)$ $(AA+XX)$$(iv)$ Sex determination in humans

Describe the haplo-diploid sex determination system.

$A$ hereditary disease which is never passed on from father to son is

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$A$: Non-allosomic genic determination of sex is found in bacteria.
$R$: Sex is dependent on some environmental factors in prokaryotes.

Match the following columns:
Column-$I$ Column-$II$
$(P)$ $(X+O)$ $(i)$ Genetic constitution in Drosophila
$(Q)$ $(XX+XY)$ $(ii)$ Genetic constitution in grasshopper
$(R)$ $(ZZ+ZW)$ $(iii)$ Sex determination in birds
$(S)$ $(AA+XX)$ $(iv)$ Sex determination in humans