spermatogenesis oogenesis egg

Sexual reproduction is seen in nearly all animals. In animals reproduction also involves production of gametes that are haploid cells . In unicellular organisms like the protozoans, the gamete-producing individuals are called gametocytes. The gametes may be similar - isogametes as in Monocystis or ..

Sexual reproduction involves the fusion of two haploid gametes to form a diploid individual. The process by which gametes are produced in the gonads is known as gametogenesis. Gamete formation starts at puberty, an average of 9 - 11 years in girls and 11 - 13 years in boys. It is of 2 types. S..

Question: The process by which the sperms are produced is known as ____________. 1. ovulation 2. spermatogenesis 3. oogenesis 4. gestation Answer: ..

It was first reported in 1866 by Longolon Down. It is caused by the presence of an extra chromosome, No.21. Both the chromosomes of the pair 21 pass into a single egg due to non-disjunction during oogenesis in the mothers ovary. Thus, the egg has 24 chromosomes instea..

Summary - Animals may reproduce by asexual and sexual modes. The reproductive system of sexually reproducing animals consists of primary sex organs which produce the gametes, the secondary sex organs which participate in reproduction but do not form gametes and accessory sex characters which distin..