Page 65 - Genius Kidz Prudence Learning Sc-8

FERTILIZATION IN HUMAN BEINGS

Process of fertilization : Embryo moves to the uterus
In the case of human beings, fertilization is
internal. It gets attached here with the help of

Millions of sperms One ova is developed placenta

are produced in after every 28 days by
males every day a female Embryo develops further to form body
structure. The stage at which complete body
structure is formed is called as a foetus

Birth of a baby after a period of nine months
Many sperms are introduced into the woman's
vagina during copulation (or mating).

Sperms swim and move up to the uterus and
then enter the oviduct

One sperm fuses with one ovum in a oviduct to
form a zygote

Cell
membrane
Cells of The period of nine months required for the
corona radiata Male
pronucleus development and growth of a zygote to form a
(haploid) foetus or a baby is called gestation period.
Nucleus
(diploid) The number of eggs produced at a time is
Female different for different mammals. Human
Sperm pronucleus
(haploid) beings, elephants, cows, etc. Usually produce
Perivitelline
Zona space one egg at a time. Cats, dogs and rabbits
pellucida
Egg (ovum) produce more than one egg at a time. Hence
Fertilization
more babbies are born to them at a time. The
Embryo development :
zygote results from the fusion of sperm cell
Zygote from father and egg cell from mother. Hence it

has the chromosomes of both mother and

Divison of zygote form ball of cells called father. Thus the new individual inherits
embryo characteristics from both the parents.

Men are more that 30% stronger than women on an average, especially the upper body and men's brain are heavier
than women's.

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