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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.
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.
The female-biased sexual size dimorphism observed in many taxa evolved despite intense male-male competition for mates. [28] In Osmia rufa , for example, the female is larger/broader than males, with males being 8–10 mm in size and females being 10–12 mm in size. [ 29 ]
"Felis" alone is the genus name for the group that includes the domestic cat. Examples: Dinofelis ("terrible cat"); Eofelis ("dawn cat"); Pardofelis ("leopard cat")-form, -formes: Pronunciation: /foʊrm/, /foʊrms/. Origin: Latin: forma. Meaning: shape, form. Used for large groups of animals that share similar characteristics; also used in ...
Sexual differentiation is the process of development of the sex differences between males and females from an undifferentiated zygote. [1] [2] Sex determination is often distinct from sex differentiation; sex determination is the designation for the development stage towards either male or female, while sex differentiation is the pathway towards the development of the phenotype.
The list of organisms by chromosome count describes ploidy or numbers of chromosomes in the cells of various plants, animals, protists, and other living organisms.This number, along with the visual appearance of the chromosome, is known as the karyotype, [1] [2] [3] and can be found by looking at the chromosomes through a microscope.
The word dzo technically refers to a male hybrid, while a female is known as a dzomo or zhom. In Mongolian, it is called a khainag (хайнаг). There is also the English language portmanteau term of yattle, a combination of the words yak and cattle, [1] as well as yakow, [2] [3] a combination of the words yak and cow.
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 ]