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Sex Determination

 

Many simple one celled animals are unisex: each one reproduces itself by splitting into two cells identical with their parent. man and other complex animals breed differently. Such species contain males and females. Special cells from a male and female fuse to produce a cell that shares hereditary material from both its parents. This cell multiplies by splitting to give rise to an adult organism identical with neither  parent. So sexual reproduction produces countless permutations of individuals. This means there are likely to be some able to endure changes to their surroundings that kill most of the rest. Sex then, is an ingenious biological device to help a species to survive in a changing world.

The blue print determining which sex you are was laid down in you are was laid down in your parents chromosomes - packages of hereditary material contained in every body cell. by determining how each cell grows, your chromosomes also help control such hereditary traits as body build and color of hair and eyes. the nucleus of each ordinary cell holds 23 pairs of chromosomes . When a cell splits in two to build or repair body tissue its chromosomes double up and divide, so each new daughter cell also receives 23 pairs. but sperm ( male sex cells) and eggs or ova (female sex cells) are different. 

A Girl or a Boy

When the body makes sex cells each gets only 23 chromosomes, one of which carries a sex - determining factor. All eggs and one in two sperm have what is called an X chromosomes, which carries the "female" factor. The other sperm have a Y chromosome carrying the ' male ' factor. 

Girl

 

If an egg is fertilized by a sperm with an X chromosome  the resulting child will have two X chromosomes (XX) and be female. 

 

Boy

 

If fertilization is by a sperm with a Y chromosome, the child will have one X and one Y chromosome (XY) and be male. 

 

 

Know the Fact 

In the society of developing  countries like Bangladesh a common feature  is that if a woman gives birth to  more than one girl baby,  often she has to face physical and mental torture by  husband and his  family as if she is the only responsible for it. 

But what science of  human biology  says is that whether a girl or boy will be born completely depends on  male sperms  that  contain both chromosome  X ( female factor) and  Y( male factor)  whereas  woman's egg contains only  X ( female factor) chromosome. 

So, know the science , agree with the truth  and act logically. 

 

Rare Combinations

Rare errors in the reassortment and recombination of chromosomes either during sex cell formation or fertilization result in chromosomal sex abnormalities, of which the following are examples.

An XXX combination results in a normal looking but possibly infertile female.

If there is one X but no Y chromosome ( XO), the result is an infertile female with sex organs that fail to mature.

An XYY combination results in a male with normal sex organs, but perhaps with other problems.

Combinations such as XXY or XXXYY produce males whose sex organs remain immature and who may develop female secondary sexual characteristics at puberty.


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