Question

How many autosomes are in a karyotype?

Answer 1

Hint: Autosome is any of the numbered chromosomes, other than the sex chromosomes. Karyotype is a collection of chromosomes. It also refers to a laboratory technique which produces an individual's chromosomes’ images.

Complete answer:
-An autosome is one of the 22 pairs of chromosomes, present in all normal humans.
-Humans have total 23 pairs of chromosomes, for a total of 46 chromosomes, but two of those are denoted to by letters rather than by numbers and are known as - sex chromosomes, and not autosomes, since they - the X and Y chromosome - help in determining the sex, or gender of any individual, that is, they determine whether any individual is male or female.
-The 22 pairs of autosomes are denoted by numbers.
-The karyotype is the number, size and shape of chromosomes in a cell. It includes the autosomes and the sex chromosomes.
-For instance, in a human, there are 46 chromosomes, which are present as 23 pairs of chromosomes. So, for humans, 46 is the karyotype.
-The 23 pairs include 22 pairs of autosome said and 1 pair of sex chromosomes (X and Y).
-The sex chromosomes are referred to as the X and Y chromosomes, because of their shapes.

Note: One of the most common things, to be seen in karyotyping, is an extra Chromosome 21, which is associated with Down syndrome. Karyotype number for a tiger is 38, so it has 36 autosomes found as 18 pairs. Similarly, a chimpanzee has a karyotype number 48.