What is s e x chromosome? Name the two types of s e x chromosomes. Mention the s e x chromosomes present in male and female.

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Solution

Chromosomes which are involved in determination of sex in the organisms known as Sex chromosomes.

In human beings sex chromosomes are different in males from females.
In male sex chromosomes are known as mismatched pairs because they have one normal size called X and other is short in size called as Y chromosome.
In female sex chromosomes are perfect pairs because have two X chromosomes which are identical to each other.

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Similar questions

The person A has only B chromosomes in all its gametes. On the other hand, another person C has chromosomes D in half of the gametes and chromosome E in the other half of gametes. When chromosomes B and D combine during fertilisation, a female zygote results. On the other hand, the combination of B and E chromosomes produces a male zygote.

(a) What are chromosomes (i) B (ii) D, and (iii) E?

(b) Out of B, D and E, which two chromosomes are of the same type?

(d) What is the general name of chromosomes such as B and E?

(e) Out of the two persons A and C, which one is (i) male, and (ii) female?

Q. What is the number of pairs of (i) Chromosomes (ii) autosomes in humans?How many sex chromosomes are present in male and female respectively?

When there is a single chromosome present in a haploid cell the why do we say that there are two chromosomes in the gamete cells called X and Y in males and X and X in females ?

Question 20
The two versions of a trait (character) which are brought in by the male and female gametes are situated on

(a) copies of the same chromosome
(b) two different chromosomes
(c) sex chromosomes
(d) any chromosome

Q. Match the following

	List I		List II
A	In human beings and a number of other animals, there are two types of chromosomes, ______, and allosomes.	1	44+XY
B	_______ are those chromosomes which control functions of the body, other than sex determination. Allosomes or sex chromosomes are the chromosomes that determine the sex of the individual in unisex organisms.	2	Autosomes
C	Human beings have _____ pairs of chromosomes.	3	23
D	_____ determine the sex of the individual.	4	Sex chromosomes
E	The two sex chromosomes of females are similar and are called _____ chromosomes. They are dissimilar in human males. One is a normal-sized X-chromosome. The other is smaller with a good amount of non-function chromatin. It is called the Y-chromosome.	5	XX
F	The chromosome complement of human females is ______	6	44+XX
G	Human males is _____. Human females are homogametic, i.e., produce only one type of gametes or ova (22 + X). Humans are heterogametic, i.e., they produce two types of gametes sperms, angiosperms, and gymnosperms.	7	Autosomes

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