Question

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

• A. A- 2, B- 7, C- 3, D- 4, E- 5, F- 6, G- 1
• B. A- 2, B- 7, C- 3, D- 5, E- 4, F- 6, G- 1
• C. A- 2, B- 7, C- 4, D- 3, E- 5, F- 6, G- 1
• D. A- 2, B- 7, C- 3, D- 4, E- 5, F- 1, G- 6

Answer 1

The correct option is A A- 2, B- 7, C- 3, D- 4, E- 5, F- 6, G- 1

• According to their function, chromosomes are categorized as autosomes and allosomes. Sex chromosomes or allosomes are defined as chromosomes, other than autosomes, that are involved in sex determination. Any chromosome other than sex chromosome is referred to as autosome which controls normal traits of the organism (A-2 and B-7).
• Human has a total of 23 pairs of chromosomes (C-3)
• 22 pairs of autosomes and one pair of sex chromosomes (D-4).
• Male carries “XY” sex chromosome while female carries two copies of X-chromosomes (XX; E-5) as sex chromosomes. During meiosis, all the gametes produced by females contain only the X chromosome (22 A + X), whereas males produce two kinds of gametes, 1/2 gametes with X- and 1/2 with Y-chromosome (22 A + X and 22 A + Y).
• Fertilization of egg (22 + X) with sperm carrying 22+X chromosomes results in female child (44A + XX); (F-6).
• Fertilization of egg (22 + X) with a sperm carrying 22+Y chromosomes results in a male child (44A + XY); (G-1).