Question

In man, sex-linked characters are mainly transmitted through
A) X-chromosomes
B) Autosomes
C) Y-chromosomes
D) X-chromosomes, Y-chromosome, and Autosomes.

Answer 1

Hint: The chromosomes were named for their unique properties by early researchers. It is one of the two sex-determining chromosomes in many organisms and found in both males and females. It is also part of the XY sex-determination system and the XO sex-determination system.

Complete answer:
Most of the observable features of organisms which are controlled by the genes on the chromosomes are the sex-linked characters that determine the organism's sex.
-The pair of sex chromosomes are present in each individual. One is inherited from each parent. Females have XX chromosomes and the males have XY chromosomes with 44 autosomes in both sexes.
-Both male and female genders are characterized by the genes present on the X-chromosome, Therefore, it is called criss-cross heredity but in males, genes are present on the Y-chromosomes.
-In humans, approximately 20 sex-linked characters are found on the X-chromosomes. A sex-linked trait i.e of the X chromosomes is not received by the son from his father whereas a father can pass the same sex-linked traits to his daughter only.
-Haemophilia and color blindness are some of the sex-linked hereditary diseases found in human beings.

Additional Information: Autosomes- a large number of genes, performing unique functions in the organism cells are found in an autosome which is one of the 22 number pairs of chromosomes that are carried by most of us in almost all of the cells of our body.
-Each chromosome follows a "map" that allows cells to "know" where to start the gene expression when they want to express a certain gene.
-The y chromosomes contain a sex-determining region gene, causing testes to develop in the embryo which results in the development of external and internal male genitalia. if any mutation occurs in the sex-determining region gene, the female genitalia develops in the embryo despite having XY chromosomes.
So, the correct answer is,” X-chromosomes”

Note: -In X-linked, the gene is present on the X chromosome not on the Y chromosome. There are different inheritance patterns on the X-linked genes in comparison to the genes on non-sex chromosomes also known as Autosomes because these genes are present in different numbers in males and females.
-Sex-linked characters are controlled by the genes on the chromosomes is an observable feature of an organism that determining the organism's sex.