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Dictionary » S » Sexual

Sexual

sexual

Of or pertaining to sex, or the sexes; distinguishing sex; peculiar to the distinction and office of male or female; relating to the distinctive genital organs of the sexes; proceeding from, or based upon, sex; as, sexual characteristics; sexual intercourse, connection, or commerce; sexual desire; sexual diseases; sexual generation.

(Science: biology) Sexual dimorphism, the condition of having one of the sexes existing in two forms, or varieties, differing in colour, size, etc, as in many species of butterflies which have two kinds of females.

(Science: botany) Sexual method, the selective preference of one sex for certain characteristics in the other, such as bright colours, musical notes, etc.; also, the selection which results from certain individuals of one sex having more opportunities of pairing with the other sex, on account of greater activity, strength, courage, etc.; applied likewise to that kind of evolution which results from such sexual preferences. In these cases, therefore, natural selection seems to have acted independently of sexual selection. (A. R. Wallace)

Origin: L. Sexualis, fr. Sexus sex: cf. F. Sexuel.


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Re: Natural selection is proven wrong

... How long it would take an isolated genome to speciate depends on its genetic learning rate (how fast it gains or changes new information/genes). Sexual reproduction has a good amount of crossover exchange which greatly accelerates the ability to adapt and change. Asexual reproducers such as E. ...

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by GaryGaulin
Tue Sep 01, 2009 3:00 am
 
Forum: Evolution
Topic: Natural selection is proven wrong
Replies: 177
Views: 16272

Re:

... The creation of a population that either cannot or will not bred with the original is the definition of speciation in species that unergo sexual reproduction. How can such changes result in reproductive isolation as I just defined it? One interesting example is changes in bird beak size ...

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by robsabba
Thu Aug 27, 2009 2:48 pm
 
Forum: Evolution
Topic: Natural selection is proven wrong
Replies: 177
Views: 16272

Re:

... How long it would take an isolated genome to slowly speciate depends on its learning rate (how fast it gains or changes new information/genes). Sexual reproduction has a good amount of crossover exchange which greatly accelerates the ability to adapt and change. Asexual reproducers such as E. ...

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by GaryGaulin
Thu Aug 27, 2009 9:13 am
 
Forum: Evolution
Topic: Natural selection is proven wrong
Replies: 177
Views: 16272

why women cry more than men?

[i think its women's innocence that makes them cry so much.] Women are not always so innocent when it comes to sexual matters. I think that women cry more because motherhood requires pity and/or mercy. Both require sensitivity. If women were not so sensitive towards their children, ...

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by Wilddwarf
Mon Aug 24, 2009 4:42 am
 
Forum: Physiology
Topic: why women cry more than men?
Replies: 23
Views: 12714

Why not hundreds of different sexes, why only two ?

And there are many of them, in fungi. Diploid duplication mutations probably "set up" the possibility of two-contributor sexual exchange, and triploidy is a harder thing to survive. Where there are two genders, the two have developed particular useful roles. It's all guesswork, ...

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by Darby
Sun Aug 16, 2009 8:44 pm
 
Forum: Evolution
Topic: Why not hundreds of different sexes, why only two ?
Replies: 2
Views: 94
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