Biology: Concepts and Investigations
5th Edition
ISBN: 9781260259049
Author: Hoefnagels
Publisher: MCG
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Question
Chapter 9.9, Problem 2MC
Summary Introduction
To explain:
The conditions where the evolution select for sexual reproduction in C.elegans.
Concept introduction:
The sexual reproduction involves two different parents. Each of the parents forms gametes, which at the time of fertilization fuses and leads to the formation of zygote which is genetically different from both the parents.
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What is a likely evolutionary advantage of sexual reproduction over asexual reproduction?
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Most species reproduce sexually. Some species are entirely asexual, while others can reproduce in both modalities.
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b) What can we learn about the factors that maintain sexual reproduction from studying species that can reproduce both sexually and asexually?
Chapter 9 Solutions
Biology: Concepts and Investigations
Ch. 9.1 - Prob. 1MCCh. 9.1 - How can asexually reproducing organisms acquire...Ch. 9.1 - Prob. 3MCCh. 9.2 - Prob. 1MCCh. 9.2 - Prob. 2MCCh. 9.3 - How do haploid and diploid nuclei differ?Ch. 9.3 - Prob. 2MCCh. 9.3 - Prob. 3MCCh. 9.3 - Prob. 4MCCh. 9.4 - What happens during interphase
Ch. 9.4 - How do the events of meiosis I and meiosis II...Ch. 9.5 - Prob. 1MCCh. 9.5 - Prob. 2MCCh. 9.5 - How are identical twins different from fraternal...Ch. 9.6 - Prob. 1MCCh. 9.6 - In what ways are mitosis and meiosis different?Ch. 9.7 - Prob. 1MCCh. 9.7 - Prob. 2MCCh. 9.8 - What are the stages of sperm development in...Ch. 9.8 - Prob. 2MCCh. 9.8 - How does gamete production in plants differ from...Ch. 9.9 - Prob. 1MCCh. 9.9 - Prob. 2MCCh. 9 - Prob. 1MCQCh. 9 - Prob. 2MCQCh. 9 - Prob. 3MCQCh. 9 - Prob. 4MCQCh. 9 - Prob. 5MCQCh. 9 - Explain why evolution often selects traits that...Ch. 9 - Describe a situation in which asexual reproduction...Ch. 9 - Prob. 3WIOCh. 9 - Draw all possible metaphase I chromosomal...Ch. 9 - Prob. 5WIOCh. 9 - List examples of abnormalities in chromosome...Ch. 9 - Prob. 7WIOCh. 9 - Prob. 8WIOCh. 9 - 1. Review section 9.5 and the Survey the Landscape...Ch. 9 - 2. Fit the following terms into this concept map:...Ch. 9 - 3. Create a separate concept map that includes...
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- What are the evolutionary advantages for an organism to reproduce both asexually and sexually?arrow_forwardIn C. elegans there are two sexes: hermaphrodite and male. Sex is determined by the ratio of X chromosomes to haploid sets of autosomes (X/A). An X/A ratio of 1.0 produces a hermaphrodite (XX), and an X/A ratio of 0.5 results in a male (XO). In the 1970s, Jonathan Hodgkin and Sydney Brenner carried out genetic screens to identify mutations in three genes that result in either XX males (tra-1, tra-2) or XO hermaphrodites (her-1). Double-mutant strains were constructed to assess for epistatic interactions between the genes (see table). Propose a genetic model of how the her and tra genes control sex determination.arrow_forwardWhy must the life cycle of sexually reproducing species alternate between haploid and diploid stages? A) Mitosis must occur at some point in the life cycle to prevent a doubling of chromosomes in each generation. B) Meiosis must occur at some point in the life cycle to prevent a doubling of chromosomes in each generation. C) Mitosis must occur at some point in the life cycle to prevent a reduction of chromosomes in each generation. D) Meiosis must occur at some point in the life cycle to prevent a reduction of chromosomes in each generation.arrow_forward
- Some organisms—for example, certain fungi—reproduce asexually when the environment is favorable and sexually when the environment becomesunfavorable. What might be the evolutionary advantage of sexual reproduction with the associated process of meiosis during unfavorable conditions?arrow_forwardIn eukaryotic reproduction two haploid gametes fuse together to produce a diploid zygote which will grow into a new living organism with characteristics from both parents. true or false?arrow_forwardThe most notable differences between gamete formation in most animals and gamete formation in plants is that ______________. a) plants produce gametes in somatic tissue, whereas animals produce gametes in germ tissue b) plants produce gametes by mitosis, whereas animals produce gametes by meiosis c) plants produce only one of each gamete, but animals produce many gametes d) plants produce gametes that are diploid, but animals produce gametes that are haploidarrow_forward
- Why do diploid organisms that reproduce via sexual reproduction even bother with meiosis? What is the point of this complex and energetically expensive process?arrow_forwardIdentify the stage of meiosis diploid cells of this species have 3 homologous pairs of chromosomes a b and ca) prophase b) telophase c) anaphase d) prophase 2 e) telophase 2Activation of the adrenal cortex produce androgens is called adrenarche ? True/falseHow does photosynthesis relate to cellular aerobic respiration?arrow_forwardWhat is the difference of sexual reproduction from asexual reproduction?arrow_forward
- Which of the following is true about cleavage in C. elegans. Choose all possible answers. a) Exhibit a rotational holoblastic cleavage b) During the second division, the dorsal-ventral axis is determined. c) Cells are enveloped to an egg membrane called a chorion. d) Each of symmetric division process one differentiated descendant. e) At the transition between the 2 and 4-cell stages, the right-left axis can be seen.arrow_forward6) Classify the following as either Sexual or Asexual Reproduction. Give the specific type of asexual reproduction. a) A small piece of a cactus breaks off the plant, falls to the ground, and begins to grow. b) Pollen from a male poplar tree fertilizes sex cells on a female poplar tree. c) Two earthworms each produce sperm and eggs and fertilize each other. d) A flatworm is cut in half and grows into two flatworms.arrow_forwardOne potential advantage of sexual reproduction is that offspring will have more genetic ______________ compared to offspring produced by asexual reproduction. Group of answer choices A)diversity B)identity C)similarity D)diplomacyarrow_forward
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