Ch. 8, 9, and 10
Ch. 8, 9, and 10 BIOE 140 - 01
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This 2 page Class Notes was uploaded by Jonah Lynch on Tuesday October 27, 2015. The Class Notes belongs to BIOE 140 - 01 at University of California - Santa Cruz taught by Sinervo,B.R. in Fall 2015. Since its upload, it has received 26 views.
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Date Created: 10/27/15
Mate Choice Fish Mating The ancestral state for sh is for neither parent to contribute or invest much in offspring Derived states of male investment 0 Stickleback male nest care piper sh male brood patch Dbrood pouch seahorses placenta Piper sh Mate Selection 0 Both select larger size option and females are ashier with a big ap Operational Sex Ratio 0 When the sex ratio leaves a few males with many females male choiceness increases Nuptial Gifts 0 Increase the likelihood of mating Mormon Crickets deliver a half edible sperm package Males extended phenotype Extended Phenotype Direct Bene ts D the territory extra that the organism has to offer not his genes he offers to pass down indirect bene ts Widow Bird Tail Length Manipulation Shows that female choice preference long tails and that it this is not correlated with territory loss 0 This is an example of an Honest Indicator that more or less reveals the physiological quality of the animal Guppy Guppies in high predatory areas evolve less orange spotting and female preference follows This contrasts low predatory areas in which the opposite has evolved Other Models not runaway sexual selection 0 Good Genes Model Indicator 0 One that can39t grow an impressive ornament probably has worse genes 0 However correlation of female preference and male ornament in sh support the runaway theory 0 However peacocks with big spots randomly mated have more surviving young than peacocks with smaller spots 0 Zahavi39s Handicap Principal If an organism can maintain a costly trait and survive then it must have good genes HamiltonZuk Hypothesis o A good genes model for parasites o 1 Parasites must reduce survival 2 Resistance should be heritable 3 Connect to ornament 4 Female preference of large ornament o This was demonstrated with the barn swallow no common household effect in mite infestation between swallow nests Male Symmetry Symmetry is thought to signify healthy development 0 Bar removal or addition on one side of the sword tail sh had smaller female mates Major Histocompatability Locus MHC locus A point in human genetics at which mates prefer the distinctive option This is thought to increase human ability to counter disease Matecopying Active Choice 0 To copy the other generations selections Inactive Choice Sensory preference inherent in the organism Best of N 0 Choosing the best mate from a huge selection of mates increases tness but it presents a perceptual limitation
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