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Zoetis Inc. (/zō-EH-tis/ [4]) is an American drug company, the world's largest producer of medicine and vaccinations for pets and livestock. [ 5 ] [ 4 ] [ 6 ] The company was a subsidiary of Pfizer , [ 7 ] the world's largest drug maker , but with Pfizer's spinoff of its 83% interest in the firm it is now a completely independent company.
Although the hybrid may be sterile, it can continue to multiply in the wild by asexual reproduction, whether vegetative propagation or apomixis or the production of seeds. [ 35 ] [ 36 ] [ clarification needed ] Indeed, interspecific hybridization can be associated with polyploidia and, in this way, the origin of new species that are called ...
Protandrous simultaneous hermaphroditism: Early pure male reproduction and later reproduction in both sexes. [ 12 ] Furthermore, there are also species that reproduce as both sexes throughout their lifespans (i.e simultaneous hermaphrodites ), but shift their reproductive resources from male to female over time.
Male genitalia of Lepidoptera. The main component of the male reproductive system is the testicle, suspended in the body cavity by tracheae and the fat body.The more primitive apterygote insects have a single testis, and in some lepidopterans the two maturing testes are secondarily fused into one structure during the later stages of larval development, although the ducts leading from them ...
A sperm fertilizing an egg in sexual reproduction is one stage of reproductive success Reproductive success is an individual's production of offspring per breeding event or lifetime. [ 1 ] This is not limited by the number of offspring produced by one individual, but also the reproductive success of these offspring themselves.
In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...
In normal sexual reproduction, the father has two sets of chromosomes, and crossing over takes place between the chromatids of each pair during the meiosis which produces the sperm. Therefore, the sperms are not identical , because in each chromosome of a pair there will be different alleles at many of the loci .
Fertilization was not understood in antiquity. Hippocrates believed that the embryo was the product of male semen and a female factor. Aristotle held that only male semen gave rise to an embryo, while the female only provided a place for the embryo to develop, [5] a concept he acquired from the preformationist Pythagoras.
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