Search results
Results From The WOW.Com Content Network
The ZW sex-determination system is a chromosomal system that determines the sex of offspring in birds, some fish and crustaceans such as the giant river prawn, some insects (including butterflies and moths), the schistosome family of flatworms, and some reptiles, e.g. majority of snakes, lacertid lizards and monitors, including Komodo dragons.
The biologist Thierry Lodé proposed (2001, 2012) five modes of reproduction based on the relationship between the zygote (fertilised egg) and the parents: [1] [2] Ovuliparity: fertilisation is external, the oocytes being released into the environment and fertilised outside the body by the male. [1]
A breeding pair of Persian leopards. Breeding pair is a pair of animals which cooperate over time to produce offspring with some form of a bond between the individuals. [1] For example, many birds mate for a breeding season or sometimes for life.
Reproduction (or procreation or breeding) is the biological process by which new individual organisms – "offspring" – are produced from their "parent" or parents. There are two forms of reproduction: asexual and sexual. In asexual reproduction, an organism can reproduce without the involvement of another organism.
[citation needed] In most non-human primates, the reproductive success and survival of offspring is highly dependent to the mother's ability to produce food resources. [46] Therefore, one component of cooperative breeding is the delegation of offspring holding, which allows the mother to forage without the added costs of holding her offspring. [46]
In species that use the XY sex-determination system, parthenogenetic offspring have two X chromosomes and are female. In species that use the ZW sex-determination system the offspring genotype may be one of ZW (female), [30] [31] ZZ (male), or WW (non-viable in most species, [33] but a fertile, [dubious – discuss] viable female in a few, e.g ...
Download as PDF; Printable version; ... Bird breeding (3 C, 27 P) Birth (5 C, 4 P) Animal breeding (14 C, 46 P) ... Reproduction in animals.
Anisogamy is a form of sexual reproduction which involves the fusion of two unequally-sized gametes. In many animals, there are two sexes: the male, in which the gamete is small, motile, usually plentiful, and less energetically expensive, and the female, in which the gamete is larger, more energetically expensive, made at a lower rate, and ...