Unformatted text preview: gametes WITHOUT fertilization!
Parthenogensis! Chromosome duplicated
and developed into a 2N adult. Example:((In$2001,$a$hammerhead$shark$was$$
produced$via$parthenogenesis$ b/c no male
Chromosome of egg duplicated to make a
2N adult, OR an egg and polar body fused Sexual(Reproduc5on:((an$evolu8onary$enigma$ b/c its VERY COSTLY! Requires a lot of energy. And its gross
Give$birth$to$$ Give$birth$to$$ Give$birth$to$$ Genera8on$3$
Etc.$$ Etc.$$ Etc.$$ Etc.$$ Give$birth$to$$ Genera8on$4$
Which(strategy(of(reproduc5on(is(more(successful?((( bvi asexual…8 offspring vs. just 1 Why(( Increases in frequency with each generation….in SEXUAL reproduction, frequency stays the same
Which(strategy(of(reproduc5on(is(more(common(in(animals?((( exual reproduction mehhh Why?( The genetic variation in the offspring of SEXUAL reproduction is favorable….it enhances reproductive success,
esp with environments change frequently! When they produce gametes & mate Reproduc5ve(cycles:((Oeen$8ed$to$changing$seasons$
$ REPRODUCTIVE TIMING IS VERY
( Around spring time (5 months after fall/winter)
Offspring have greatest chance of survival
in the spring bc they have food (grass)
available to them In fall/winter signals reproductive cycle Voila Environmental$Cues$$$$$$$$$$$$$$$$$$$$$$$$$$$$Hormones$$$$$$$$$$$$$$...
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This document was uploaded on 02/04/2014.
- Spring '14