internal fertilisation

Organisms like birds, insects, reptiles are also oviparous. However, in these organisms the fertilisation is internal. Internal fertilisation occurs in mammals also. In internal fertilisation the sperms are released into the body of the fe..

As a result of copulation, semen containing sperms is ejaculated into the vagina. Once the semen (mixture of spermatozoa and accessory fluids) is deposited into the vaginal passage of the female, the spermatozoa start their journey through the uterus to reach the oviducts. On an average, the sperma..

Fertilisation can be defined as the fusion of the sperm nucleus with the egg nucleus to form a diploid cell known as zygote. The fertilisation is internal in the human reproductive system. It is achieved by the insertion of the male organ, penis into the vagina of the..

Fertilisation can be defined as the fusion of the sperm nucleus with the egg nucleus to form a diploid cell known as zygote. The fertilisation is internal in the human reproductive system. It is achieved by the insertion of the male organ, penis into the vagina of the ..

In rats, as in all vertebrates, sexes are separate. Male and female exhibit several differences in their external features. The Male reproductive system consists of a pair of testis that are enclosed in scrotal sacs, a pair of vas deferens, a seminal vesicle, ejaculatory duct and penis. The female ..

>hermaphrodite . However, fertilisation is between the gametes of different individuals. Most of the animals are unisexual with an individual only producing either male or female gametes. The male gamete of one individual fertilizes with the female gamete of another individual to produce ..

>The male gamete of one individual fertilizes the female gamete of another individual to produce the zygote. The fertilisation may be external or internal. External fertilisation takes place in animals like the fish and frog where the fertilisation takes place in ..

. After fertilisation, the fertilised ovum trickles down into the uterus for implantation. Cleavage is the process which transforms the fertilised ovum into a sphere of closely aggregated cells. The fertilised ovum divides repeatedly in close succession to fo..

Oviparous Oviparous Oviparous Oviparous Mostly Viviparous Fertilisation External Internal External Internal Internal Examples Cartilagenous Rays sharks Bony Fishes Hemiramphus Hippocampus Froas Toads Salamanders Turtle..