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Male guppies that are brighter in color have an advantage in mating as they attract more females in general, but they have a higher risk of being noticed by predators than duller males. Male guppies evolve to be more dull in color and have fewer, smaller spots under intense predation both in wild and in laboratory settings. [38]
When a female dies a juvenile (male) anemone fish moves in, and "the resident male then turns into a female and reproductive advantages of the large female–small male combination continue". [22] In other fishes sex changes are reversible. For example, if some gobies are grouped by sex (male or female), some will switch sex. [14]: 164 [21]
Similar sexual dimorphism and mating choice are also observed in many fish species. For example, male guppies have colorful spots and ornamentations, while females are generally grey. Female guppies prefer brightly colored males to duller males. [18] [page needed]
In many cases, the eggs are dependent on the male for oxygen and nutrition so these fish can be further defined as viviparous livebearers. [citation needed] Many cichlids are mouthbrooders, with the female (or more rarely the male) incubating the eggs in the mouth. Compared with other cichlids, these species produce fewer but bigger eggs, and ...
Guppies are located across several isolated streams in Trinidad and male colour patterns differ geographically. Female guppies have no coloration but their preference for these colour patterns also vary across locations. In a mate choice study, female guppies were shown to prefer males with colour patterns that are typical of their home stream ...
Turpin, who holds a Ph.D. in pathology, explained there are a few traditional ways to tell the gender of days-old chicks. For certain breeds, sex is identifiable by their feathers.
In guppies, Y-linked genes help determine sex selection. This is done indirectly by traits that allow the guppy to appear more attractive to a prospective mate. These traits were shown to be on the Y-chromosome and thus Y-linked. [10] Also in guppies, it appears that the four measures of sexual activity is Y-linked. [11]
COMMENT: Pop pensioners Pete Waterman and Mike Stock have slated Sabrina Carpenter’s multi-award-winning music, lyrics, and wardrobe. Haven’t we changed this record already, asks Olivia Petter