(A) In humans,there are $23$ pairs of chromosomes in each cell. Out of these,$22$ pairs are autosomes,and the $23$rd pair consists of sex chromosomes.

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(A) In humans,there are $23$ pairs of chromosomes in each cell. Out of these,$22$ pairs are autosomes,and the $23$rd pair consists of sex chromosomes. In human females,the $23$rd pair of sex chromosomes is identical,represented as $XX$. In human males,the $23$rd pair consists of one $X$ and one $Y$ chromosome,represented as $XY$.

Class 10 Science Heredity Mix Examples - Heredity and Evolution

Easy

What is the genetic constitution of the $23$rd pair of sex chromosomes in a human female?

A
$XX$
B
$YX$
C
$XY$
D
$XY$ or $XX$

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Mix Examples - Heredity and Evolution

Which of the following is the correct match between List-$I$ and List-$II$?

List-$I$ List-$II$

$1$. Acquired trait $a$. Wings of a bird and wings of a butterfly

$2$. Evidence of evolution $b$. Wings of a bird and forelimb of a lizard

$3$. Homologous organs $c$. Docked tail of a mouse

$4$. Analogous organs $d$. Fossils

List-$I$	List-$II$
$1$. Acquired trait	$a$. Wings of a bird and wings of a butterfly
$2$. Evidence of evolution	$b$. Wings of a bird and forelimb of a lizard
$3$. Homologous organs	$c$. Docked tail of a mouse
$4$. Analogous organs	$d$. Fossils