Skip to main content Skip to Search Box

Definition: sexual reproduction from Hawley's Condensed Chemical Dictionary

A type of reproduction in which two parents give rise to offspring that have unique combinations of genes inherited through the gametes of the two parents. Sexual reproduction involves meiosis and syngamy.


Summary Article: sexual reproduction
from The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide

Reproductive process in organisms that requires the union, or fertilization, of gametes (such as eggs and sperm). These are usually produced by two different individuals, although self-fertilization occurs in a few hermaphrodites such as tapeworms. Most organisms other than bacteria and cyanobacteria show some sort of sexual process. Except in some lower organisms, the gametes are of two distinct types called the egg (ovum) and the sperm. The organisms producing the eggs are called females, and those producing the sperm, males. The fusion of a male and female gamete produces a zygote, from which a new individual develops. See reproduction.

Gametes are produced by meiosis. If the male and female gametes are produced by two different individuals, sexual reproduction combines inherited information from the two parents. In mammals, the male gametes, sperm, are made in the testes, while the female gametes, eggs (ova), are made in the ovaries.

Most animals and plants reproduce sexually, though quite a few plants also reproduce asexually. The male and female sex organs of a plant are usually found in a flower. Many flowers contain both male and female organs. The male gametes of a plant are inside the pollen grains, and the female gametes are inside the ovules.

In micro-organisms, asexual reproduction is very common. Yeasts and a few bacteria may reproduce sexually, although most reproduce asexually.

Other forms of reproduction The alternatives to sexual reproduction are parthenogenesis and asexual reproduction by means of spores.

essays

Female reproductive system

Male reproductive system

How Strawberry Plants Reproduce

Sexual and asexual reproduction

Genetic causes of variation

images

human reproductive organs

human sexual organs

sexual reproduction

animations

development of a human fetus

flower fertilization

© RM, 2018. All rights reserved.

Related Articles


Full text Article sexual reproduction
Penguin Dictionary of Biology

A misleading phrase, for the essential processes of sex (gene RECOMBINATION and/or transfer) and reproduction (production of new...

Full text Article sexual reproduction
Academic Press Dictionary of Science and Technology

Reproduction involving the union of gametes from two parental cells. ...

Full text Article sexual reproduction
Cambridge Dictionary of Human Biology and Evolution

Production of offspring by the regular alteration of gamete formation, usually haploid , and the fusion of recombined gametes into a ...

See more from Credo