University:
Amherst College
Course:
BIOL 220 | Developmental Biology
Academic year:

2024
Views:

399

Pages:

1
Author:

natliehayx3g

Selection for GIANT sperm… Selection for GIANT sperm… Differences in sperm length appear driven by differences in length of female reproductive tract D. bifurca testes are 11% of body weight, each sperm is 20X length of male Drosophila bifurca Drosophila pseudoobscura 0.36 mm sperm GIANT sperm… Sperm competition How to test experimentally? Bidirectional artificial selection for seminal receptacle (SR) length (in females) and sperm length (in males) Sperm production in D. bifurca only 6X faster than egg production – recall Bateman’s rule Long-sperm male Short SR female Measure fertilization success among male-female pairs from these four groups Male fertilization success Selection for Drosophila bifurca 58.3 mm sperm Short male Long female SR length Sperm competition driving some species back toward isogamy?

Selection for Giant sperm

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