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Alternation between a multicellular diploid and a multicellular haploid generation is never encountered in animals. [33] In some animals, there is an alternation between parthenogenic and sexually reproductive phases , for instance in salps and doliolids (class Thaliacea). Both phases are diploid.
Vegetative meiosis can occur in haplodiplontic and also in diplontic life cycles. The gametophytes remain attached to and part of the sporophyte. Vegetative (non-reproductive) diploid cells undergo meiosis, generating vegetative haploid cells. These undergo many mitosis, and produces gametes.
In the diplontic life cycle (with pre-gametic meiosis), as in humans, the organism is multicellular and diploid, grown by mitosis from a diploid cell called the zygote. The organism's diploid germ-line stem cells undergo meiosis to make haploid gametes (the spermatozoa in males and ova in females), which fertilize to form the zygote.
Nonbinary (sometimes spelled non-binary) is used to describe anyone whose gender isn’t exclusively masculine or feminine. This means that they don’t fit (or rather, conform) to what society ...
The reported discrimination non-binary people face includes disregard, disbelief, condescending interactions, and disrespect. [100] Non-binary people are also often viewed as partaking in a trend and thus deemed insincere or attention-seeking. As an accumulation, erasure is often a significant form of discrimination non-binary people face. [100]
Because binary means “two,” if someone doesn’t identify as male or female, they could be non-binary. Non-binary folks may also use terms like “gender nonconforming” because they don’t ...
Ploidy can also vary between individuals of the same species or at different stages of the life cycle. [ 55 ] [ 56 ] In some insects it differs by caste . In humans, only the gametes are haploid, but in many of the social insects , including ants , bees , and termites , males develop from unfertilized eggs, making them haploid for their entire ...
Note 2: South (1987) uses the terms zygotic, gametic, sporic and somatic life cycles; D'Amato (1977) uses the terms haplontic, diplontic and diplohaplontic life cycles, Ruppert (2004) uses the terms asexual haploid cycle, sexual haploid cycle, diploid cycle and haplodiploid cycle.