reproduction in humans

In multicellular organisms, the male gametes called the are produced by the male reproductive part and the female gametes called the eggs are produced by the female reproductive part. The male gamete of one individual fertilizes the female gamete of another individual to pr..

These are protozoans which occur as endoparasites in different groups of animals. They lack locomotor structures. The body has a tough covering called cuticle and a single nucleus. Asexual reproduction occurs by multiple fission. Sexual reproduction involves anisogamy. Life cycl..

Fertilisation - 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 o..

Increasing population is a serious issue, particularly in developing countries. It is necessary for every generation to produce more off springs because many individuals do not survive to reach the reproductive age due to natural causes. However, man has upset this equation as he has been..

Increasing population is a serious issue, particularly in developing countries. It is necessary for every generation to produce more off springs because many individuals do not survive to reach the reproductive age due to natural causes. However, man has upset this equation as he has bee..

Once, a very beautiful actress met the famous English playwright, George Bernard Shaw. She wanted to propose to him and whispered, "Will it not be wonderful if our child has my beauty and your brains?" To this Bernard Shaw retorted, "What if the child has your brains and my looks!" What do you thi..

From the above observations of production of different traits, it is clear that in sexual reproduction, the genetic materials from the two sexes participating are different from each other. All human chromosomes are not paired similarly, the sex chromosomes in men is odd in not..

The cyclic changes in the ovary and uterus are under the control of estrogen and progesterone hormones whose secretion is under the control of gonadotropic hormones secreted by anterior pituitar..

Parthenogenesis is a form of reproduction in which the ovum develops into a new individual without fertilisation. Natural parthenogenesis has been observed in many lower animals (it is characteristic of the rotifers), especially insects, e.g., the aphid. In many social insects, such as th..

Impact of Misuse of Natural Resources - Natural resources characteristically exhibit two features. They are: 1) Physical limitations 2) Limitations of regeneration / production. Natural physical resources like geophysical, hydro-geological, edaphic, atmospheric resources exhibit physical limitation..