Question

What would result if fertilisation takes place in

humans? Also, incorporate the post-fertilisation

changes.​

Answer 1

Answers related for fertilization and post fertilization are given below -

On fertilization of ovum and sperm, zygote is formed. After fertilization it undergoes mitosis and forms 2, 4 and 8 celled stage.

Further it develops into morula and blastula. Then uterus prepares itself for implantation. The process occurs and is defined as attachment of blastocyst to uterine wall.

After this, blastocyst starts development and the period is known as gestation period. It lasts for 280 days.

Answer 2

The correct answer is:

Explanation:

• After the fusion of the male's gamete, sperm, with the female's gamete,  ovum, a  Zygote, that is, unicellular and diploid in nature.
• This zygote undergoes repeated division of cells called Cleavage to form:

1. Morula which is comprised of 16 cells and is a solid mass of cells.
2. Blastula which is spherical contains cell clusters called blastomeres along with a cavity filled with fluid called the Blastocoel.
3. The Blastula or blastocysts burrows and fixes itself into the wall of the uterus.
4. Next, it undergoes gastrulation to form the three germinal layers which are Ectoderm, Endoderm and Measoderm.
5. After these the organs develop, and eventually the child is formed.