CAMPBELL BIOLOGY V1 PKG >C<
CAMPBELL BIOLOGY V1 PKG >C<
15th Edition
ISBN: 9781269881555
Author: Reece
Publisher: PEARSON C
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Chapter 46, Problem 10TYU
Summary Introduction

To determine: Why motile species are less often hermaphrodites.

Concept introduction:

Hermaphroditism is a condition in which an organism has both male and female reproductive systems. They produce both male and female gametes, so any two organisms can mate. In hermaphrodites, the gametes produced by meiosis have different genetic makeup than the parent organism.

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What is a dauer larva ? It's a larva from a special variant of C. elegans that was first identified in samples from soil in Germany It is a larva that shows accelerated development in highly nutritious environments Dauer is just the technical term for "hermaphrodite" - so dauer larva means hermaphrodite adult It's a larva that arrests development in a low metabolic and enduring stage, caused by harsh environmental conditions. The larva will remain in the dauer stage until the conditions improve, at which point they'll resume development.
In sea urchin, which step of egg and sperm recognition involves the formation of a fertilization cone?   Sperm binding to the egg's vitelline membrane   Fusion of the sperm and egg membranes   Acrosomal reaction   Chemo-attraction   Sperm binding to the egg's jelly coat
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CAMPBELL BIOLOGY V1 PKG >C<

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