Introduction

The male has two chromosomes X and Y, the female has only X chromosomes. During reproduction, if the X and X chromosomes come together then the zygote shall develop into a female if the X and Y chromosomes fuse, then the zygote shall develop into a male.

Gender Determination

The sex of the offspring depends on whether he inherits an X chromosome from the father making it XX pair [female child] or the Y chromosome from the father making it XY pair [male child].

Facts about Blood Group

Also if one parent has blood group A and second B, then the offspring may get AB.

If one parent = A, second parent =O, then A;

If one parent = B, second parent =O, then offspring may get B;

If one parent = O, second parent =O, then offspring may get O.

If one parent = AB, second parent =A/B/O, then offspring may get AB;

Chromosomal disorders

There are 23 chromosomes, 22 autosomes, and 1 pair of sex chromosomes.

Genetic disorders are Hemophilia [sex chromosome-linked passed from mother to son], Cystic fibrosis, Sickle-cell anemia [autosomal – can be passed from any parent to offspring], Color blindness [sex chromosome-linked passed from mother to son, in rare cases to daughters if the father is color blind and mother is a carrier], Phenylketonuria [autosomal], Thalassemia [ autosomal ] due to defective genes.

Miscellaneous

Allergic people release IgE antibodies and the blood cells release histamines which cause allergic reactions.

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