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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.
Such an adaptation would be "exceptionally difficult" because of the need for male and female genital structures to change at the same time. [ 4 ] Female penetration of males is known in a few species, such as seahorse , but only Neotrogla females have a well-defined organ that can be described as a penis. [ 3 ]
Two use homomorphic male heterogamety, one uses XX/XY, one uses ZZ/ZW. Remarkably, the X and Z chromosomes are homologous, and the Y and W as well. Dmrt1 is on autosome 1 and not sex-linked. This means that an XX female individual is genetically similar to a ZZ male individual, and an XY male individual is to a ZW female individual.
Similarly in Parnassius smintheus butterflies, the male deposits a waxy genital plug on the tip of the female's abdomen to prevent the female from mating again. [27] It contains sperm and important nutrients for the female, [28] and ensures that the male is the only one to fertilize the female's eggs. [27]
The examination includes checking the penis, scrotum, and urethral meatus. [1] A comprehensive assessment of the male genitals assesses the pubic hair based on Sexual Maturity Rating and the size of the testicles and penis. [2] The exam can also be conducted to verify a person's age and biological sex.
In 2017, she created the YouTube comedy show Baited with Ziwe and its 2020 Instagram Live iteration. [4] She wrote for Desus & Mero from 2018 to 2020, [5] and she co-hosted Crooked Media's Hysteria podcast in 2018. [6] Fumudoh starred in and executive produced the Showtime variety series Ziwe (2021–2022).
The story was developed as a Hollywood-style heist/caper thriller, but the writers made efforts to ground it in a context that would still be relatable to a Thai audience. [8] A major challenge, according to Nattawut, was telling the story of students taking exams—"perhaps the most boring activity on earth"—in a compelling manner. [ 6 ]
Pelvicachromis is a genus of small (5.5–12.5 cm or 2.2–4.9 in), brightly coloured cichlids from tropical West Africa and Central Africa. They typically inhabit soft, acidic water (pH 5.6 – 6.9). All species form monogamous pairs and use caves as spawning sites. Most are easily spawned in captivity with adequate water quality.