Determination of Sex
Determination of Sex
Determination of Sex of the Child
Human beings have 46 chromosomes in the nuclei of their cells. Of these, 44 are known as autosomes and the last pair is termed the sex chromosomes. This last pair is different in males and females. In males, it is XY and in females it is XX. The gametes (ovum and sperm) have half the number of chromosomes as that of cells occurring elsewhere in the body. This means that an egg will always have 22 + X chromosomes while a sperm will have either 22 + X or 22 + Y chromosomes.
During fertilization, if an egg fuses with a 22 + Y sperm, the resultant zygote will develop into a male child and if an egg fuses with a 22 + X sperm, the resultant zygote will develop into a female child. After understanding this, can you now analyze, which of the two, the father or the mother is responsible for determining the sex of the child.
Sex Determination - Boy or Girl :
What determine whether the baby developing inside the mothers womb is a boy or a girl? This is determined by a thread like structure called chromosomes. Chromosomes, located inside the nucleus of zygote or fertilized egg, carry heredity information in the form of genes. The chromosomes which carry genes for sex determination are called sex chromosomes. Human beings have 22 pairs of autosomes (chromosomes other than sex chromosomes) and one pair of sex chromosome. Chromosomes determine everything from hair colour and eye colour to sex. Whether you are a male or female depends on the presence or absence of certain chromosomes. There are two types of sex chromosomes- X and Y. Female cell contains two X chromosomes (XX) while male cells carry one X one and one Y chromosomes (XY).
Therefore, it is the Y chromosome that is essential for the development of the male reproductive organs, and with on Y chromosome, an embryo will develop into a female.
How many sex chromosomes are present in a human cell? | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following combination of chromosomes leads to the birth of a baby girl? | |||
| Right Option : A | |||
| View Explanation | |||
What determines the sex of an individual? | |||
| Right Option : A | |||
| View Explanation | |||
Students / Parents Reviews [10]
About Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
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Hiya Gupta
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Manish Kumar
10thAbhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Om Umang
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Archit Segal
7thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
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