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HW #46 - APBiologyPeriod4#22LiemNguyen...

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AP Biology Period – 4  #22 Liem Nguyen 3/23/10 Homework #46 (090403): Chapter 46 (due Tuesday 090403) Total points: 40 for Attempt on all questions (Bullet Points) (Individual) Concept Map: 10 Points (Group) Chapter 46:  Animal Reproduction Objectives Overview of Animal Reproduction 1. Distinguish between asexual and sexual reproduction. Asexual: creation of new individuals whose genes all come from one parent  Sexual: creation of offspring by fusion of haploid gametes to form zygote Animal gametes formed by meiosis, increases genetic variability  Unique combos of genes inherited from two parents Enhances reproductive success of parents when environmental factors change  Asexual reproduction is the creation of new individuals whose genes all come from one  parent without the fusion of egg and sperm. Asexual reproduction results in a diploid  parent giving birth to a diploid offspring that matches the parent. Sexual reproduction is  the creation of offspring by the fusion of haploid gametes to form a zygote, which is  diploid.  2. List and describe four mechanisms of asexual reproduction. Fission: separation of a parent into two or more individuals  Budding: new individuals arise from outgrowths of existing ones Fragmentation: breaking of the body into several pieces Regeneration: most follow fragmentation The first step in asexual reproduction is fission, the separation of a parent into two or more  individuals of approximately equal size. Budding follows next and  is the process of new  individuals arising from outgrowths of existing ones. Fragmentation is the breaking of the  body into several pieces, some or all of which develop into complete adults. Regeneration  is the re-growth of lost body parts.
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3. Describe several adaptive advantages of asexual reproduction. Discuss the conditions   that may favor the occurrence of asexual reproduction. Enables isolated animals to produce offspring  Many offspring in short amount of time  Most advantageous in stable, favorable environments  Asexual reproduction enables animals living in isolation to produce offspring without  locating mates and can also create numerous offspring in a short amount of time.  Conditions that may favor the occurrence of asexual reproduction are stable, favorable  environments, because asexual reproduction perpetuates successful genotypes precisely.
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