Thus in sexual reproduction two hereditary tendencies are in a sense intermingled.
What other reason can there be why the circuitous process of sexual reproduction has been preferred?
The sexual reproduction of the colonies of the Volvocaceae is one of the most important phenomena presented by the Protozoa.
It is not difficult to see the advantages in the postponement of sexual reproduction until the rate of growth begins to decline.
As a matter of fact the two ideas are not mutually exclusive; sexual reproduction may accomplish both of these ends.
It has already been stated that both parthenogenesis and gemmation are ultimately derived from sexual reproduction.
But in sexual reproduction we have an exactly reverse process.
Variation is thus due to the action or stimulus of external influences, supplemented by sexual reproduction.
The clearest evidences as to the stages in the evolution of sexual reproduction is found in the plant world among the green algæ.
The actual mechanism of sexual reproduction is essentially the same wherever it occurs, whether in a seaweed or a human being.
sexual reproduction n.
Reproduction by the union of male and female gametes to form a zygote. Also called syngenesis.
|sexual reproduction |
See under reproduction.
The production of a new living thing by two parent organisms, with each parent contributing half the material in the DNA of the offspring. The young, genetically different from either parent, can rapidly adapt to their environment by means of natural selection. (See chromosomes and meiosis.)