OBJECTIVE LIFE SCIENCE
GENETICS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
22 pairs of autosomes and XX
|
|
|
23 pairs of autosomes and XO
|
|
|
23 pairs of autosomes and XY
|
|
|
23 pairs of autosomes and XX
|
Detailed explanation-1: -Male sex chromosomes are denoted as XY and female chromosomes as XX. Hence a normal human female contains 22 pairs of autosomes and 1 pair of XX chromosomes.
Detailed explanation-2: -Humans have 22 pairs of autosomes and one pair of sex chromosomes (XX or XY). Autosomes are numbered roughly in relation to their sizes. The largest autosome-chromosome 1-has approximately 2, 800 genes; the smallest autosome-chromosome 22-has approximately 750 genes.
Detailed explanation-3: -Twenty-two of these pairs, called autosomes, look the same in both males and females. The 23rd pair, the sex chromosomes, differ between males and females. Females have two copies of the X chromosome, while males have one X and one Y chromosome. The 22 autosomes are numbered by size.
Detailed explanation-4: -Two of the chromosomes (the X and the Y chromosome) determine your sex as male or female when you are born. They are called sex chromosomes: Females have 2 X chromosomes. Males have 1 X and 1 Y chromosome.