Chap 49 notes

Chap 49 notes - Reproduction Chapter 49 Learning Objective...

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Chapter 49 Learning Objective 1 * Compare the benefits of asexual and sexual reproduction * Describe each mode of reproduction, giving specific examples Asexual Reproduction * Single parent * genes of offspring identical to parent’s (except for mutations) * Benefits * energy efficient * most successful in a stable environment * Don’t have to search for a mate * Genetic stability Types of Asexual Reproduction * Budding * Small part of parent’s body grows, detaches * e.g. flatworms and annelids * Fragmentation * parent’s body breaks into pieces * each piece can develop into new animal * e.g. sea stars * Parthenogenesis * unfertilized egg develops into adult (haploid) * Rapid reproduction * Insects, reptiles, fish Budding (Fig 49-1) Sexual Reproduction * Fusion of two types of gametes ( egg and sperm ) produces offspring * Egg is large and nonmotile; sperm small and flagellate * Fusion leads to a fertilized egg ( zygote ) * Benefits * genetic variety * adaptive in unstable, changing environment
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Chap 49 notes - Reproduction Chapter 49 Learning Objective...

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