Question

Difference between External and internal fertilization

Answer 1

Fertilization is the process of fusion of haploid male and female gametes to form a diploid organism.

Explanation:

Fertilization is the process of fusion of haploid male and female gametes. Fertilization may be internal or external depending on the mode of birth, environmental conditions, etc.

External fertilization :

The fusion of male and female gametes happens outside the bodies of the parents. The gametes are released in a common medium for fertilization to take place. As the gametes are released in an external environment, the chances of fertilization and survival is very less the number of gametes produced during one spawning is high. Fertilization takes place and development is external.

Examples of external fertilization are most fishes (star fish), amphibians (frogs).

Internal fertilization :

The gametes are fused within the body of a parent. Transfer of gametes take place by a copulatory organ, in most cases it is a penis.  Usually the female gamete is released and stored in the reproductive system of the body,  through sexual intercourse male gametes are released in the reproductive system where they fuse and fertilize. The embryonic development is internal and an young one is born.

Examples of internal fertilization are Reptiles ( snakes, crocodiles etc), Aves (most birds except bats), Mammals

Answer 2

Fertilization is the process of haploid male and female gametes joining together to generate a diploid creature.

The union of haploid male and female gametes is the process of fertilization. Depending on the manner of birth, the environment, and other factors, fertilization can be internal or external.

External fertilization :

• Outside of the parents' bodies, male and female gametes fuse. For fertilization to take place, the gametes are discharged into a shared medium. Because the gametes are discharged into the wild, their odds of fertilization and survival are slim. However, the amount of gametes generated during a single spawning is large. Fertilization occurs, and growth occurs outside of the body.

• Most fish (star fish), as well as amphibians, use external fertilization (frogs).

Fertilization on the inside

• Within the body of a parent, the gametes are united. A copulatory organ, which in most cases is a penis, is used to transfer gametes. The female gamete is usually released and kept in the body's reproductive system, whereas male gametes are released and fused in the reproductive system during sexual contact. Internal embryonic development results in the birth of a child.

• Reptiles (snakes, crocodiles, and so on), Aves (most birds save bats), and Mammals are all examples of internal fertilization.