structure of gametes spermatozoan

Structure of Gametes - Spermatozoan - A sperm is a haploid male gamete which fuses with the ovum to form the diploid zygot..

A sperm is a haploid male gamete which fuses with the ovum to form the diploid zygot..

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 wh..

Here, gamete bearing structures called gametangia come closer to each other and develop a fertilisation tube through which the male gamete migrates into the female gametangium. Eg. : Phytophthora, Albu..

The spermatids formed as a result of maturation division is a typical animal cell with all the cell organelles present in it. In this form it cannot function as a male gamete. So many changes take place to change the non-motile spermatid into motile spermatozoan. The main aim of..

Pollination - The pollen grains which produce the male gametes and the ovules which bear the female gametes are borne on different structures. It therefore becomes necessary that for sexual union to occur, the pollen grains must be transferred to the stigma. The transf..

is the female reproductive part of the flower. The individual units are called the carpels or pistils . A flower may have one to many carpels, either fused or free. Each carpel is made up of the basal ovary, middle style and the upper stigma. The ovary is the chamber where there are many ovule..

>Mendel firmly believed that the parental characters mix and express in the offspring. It is now known that the homologous chromosomes from the two parents come together in the zygote as result of fusion of male and female gametes. Mendel held the view that characters are not lost complet..

According to Mendel, the genotype is made of certain structures called factors. The factors controlled the inheritance of all traits. These factors are present in pairs. The factors are now called genes. Thus the physical basis of heredity are the genes or factors. The different expressio..

Physical Basis of Heredity - According to Mendel, the genotype is made of certain structures called factors. The factors controlled the inheritance of all traits. These factors are present in pairs. The factors are now called genes. Thus the physical basis of heredity are the genes or fac..