'Intersexual selection' diaporamas de présentation

Finicky Females and Macho Males: Sexual Selection in Two Arthropods

Finicky Females and Macho Males: Sexual Selection in Two Arthropods. Vik Iyengar Department of Biology Villanova University. Sexual Selection. Fundamental question that troubled Darwin Why do some males have such gaudy traits that would appear to decrease survival?

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Lecture 2: Evolution of Populations Campbell & Reece chapters: Chapter 23

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Males and females often look different

Male. Female. Males and females often look different. Sexual Dimorphism. Males and females differ in appearance (secondary sexual characteristics) Primary sexual characteristics : reproductive organs

546 views • 26 slides

Males and females often look different

Male. Female. Males and females often look different. Sexual Dimorphism. Males and females differ in appearance (secondary sexual characteristics) Primary sexual characteristics : reproductive organs

341 views • 26 slides

Social Relations

Social Relations. Chapter 7. Outline. Introduction Mate Choice Mate Choice and Sexual Selection in Guppies Mate Choice Among Scorpionflies Nonrandom Mating Among Wild Radish Sociality Cooperative Breeders Green Woodhoopoes African Lions. Introduction.

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Color: so HOT right now!

Color: so HOT right now!. Hill, G.E. (1990) Female house finches prefer colourful males: sexual selection for a condition-dependent trait . Museum of Zoology and Department of Biology. C o l o r. Carotenoid Pigmentation Contribution of genes Condition-dependency. Study.

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Darwin and Wallace (1858) Theory of adaptive radiation Studied finches on Galapagos Islands

Darwin and Wallace (1858) Theory of adaptive radiation Studied finches on Galapagos Islands Different size and shape of beak relates to different foods. Beaks adapted to eat different types of leaves, worms, seeds etc. Embryonic development of many species is similar

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Chapter 13.17- 13.22

Chapter 13.17- 13.22. 13.17 Endangered species often have reduced in variation. Endangered species have low genetic variability and the diversity in their gene pool makes them less successful Example: Cheetahs suffered severe bottleneck (possibly two)

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