GenBio_3_SexSel

GenBio_3_SexSel - Sexual Selection Differential Investment...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Sexual Selection 1 Differential Investment in Reproduction Females generally make greater investment
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Sexual Selection 2 Males Females No. of offspring No. of matings Ergo: females choose; males compete Male fitness increases with # of matings So.…males are relatively indiscriminate Female fitness does not increase with # of matings So….females are selective (choosy) Exception: male makes larger investment Sex Role Reversal
Background image of page 2
Sexual Selection 3 Mating Strategies 2. Intrasexual Selection Î among members of one sex (i.e., male-male competition) 1. Intersexual Selection Î one sex chooses a mate (i.e., female choice) 1. 1. Intersexual selection Intersexual selection : • Requirements Requirements • Benefits Benefits • Consequences Consequences Female Choice requires: Genetic variation in male trait
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Sexual Selection 4 males with larger repertories attract more mates Acrocephalus warbler Benefits of Female Choice: • Direct Benefits: Male provides resource(s) that enhance survival or fecundity • Indirect Benefits: Male more fit, so offspring more fit (Good Genes Hypothesis)
Background image of page 4
Sexual Selection 5 Scorpion fly Scorpion fly Direct e.g. food (nuptial gift) e.g. food (nuptial gift) If nuptial gift
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/10/2009 for the course BIO 102 taught by Professor Brey during the Spring '08 term at Rutgers.

Page1 / 16

GenBio_3_SexSel - Sexual Selection Differential Investment...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online