great sex in space if there is a little too much of pro-male genes then there will be a male born."> the hookup culture gene SRY, meaning that the process of sex determination in the platypus remains unknown; [13] the juvenile hermaphroditism of zebrafishwith an unknown trigger; [11] and the platyfishwhich has W, X, and Y chromosomes.">

Genes sex. The Quarterly Review of Biology.

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One gene on the Z chromosome affects feather color ; three different alleles make feathers blue, ash-red, or brown.

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Females typically have two of the same kind of sex chromosome XXand are called the homogametic sex.

However, there are cases in which testes can develop in the absence of an SRY gene see sex reversal.

Sinauer Associates, Inc.

Pennington, L.

Current Biology.

That is, 'ash-red' is dominant to 'blue', which is dominant to 'brown'.

That amounts to an evolutionary paradox: