Sexual Reproduction In Birds

Sexual Reproduction In Birds

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The birds, the bees, chimpanzees, humans — we all do it, but few people realise that sexual reproduction actually first evolved in creatures vastly different to ourselves. View image of What is the real story of the birds and bees?



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As day length increases, photic stimulation of the hypothalamus results in the secretion of Gonadotropin releasing hormone GnRH below. FSH acts on sperm-producing structures in the testes, while LH acts on the interstitial cells of the testes causing them to secrete the steroid hormone testosterone.



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In biological terms sexual reproduction involves the union of gametes - the sperm and the ovum - produced by two parents. Each gamete is formed by meiosis see Chapter 3.

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Spring is the breeding season for most birds, but how do birds mate? Coming together in sexual copulation is essential to fertilize eggs to raise young birds, but the sex act is only a brief part of birds' courtship and pair bonds.



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Sexual selection in birds concerns how birds have evolved a variety of mating behaviors, with the peacock tail being perhaps the most famous example of sexual selection and the Fisherian runaway. Commonly occurring sexual dimorphisms such as size and color differences are energetically costly attributes that signal competitive breeding situations.



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Theoretical and empirical studies of life history aim to account for resource allocation to the different components of fitness: Here using a dataset for bird species Dataset S1 , a phylogeny, and an explicit measure of reproductive productivity, we test predictions for how mass-specific productivity varies with body size, phylogeny, and lifestyle traits.

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Sexual Reproduction In Birds

Sure, birds can fly, but how do they have sex?

Birds do it, bees do it -- but how? With corkscrew penises, "cloacal kisses," suicide mating flights and other entirely fascinating sexy-time mechanisms, it turns exposed.

Sexual Reproduction In Birds

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Sexual Reproduction In Birds

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Sexual Reproduction In Birds

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