EBK BIOLOGY
5th Edition
ISBN: 8220100667978
Author: Maier
Publisher: PEARSON
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Chapter 12, Problem 4LTB
Summary Introduction
Introduction:
Reproductive isolation can be defined as when the environment may carry out an outside barrier to the reproduction, such as a mountain range or river. Pre-fertilization reproductive barriers disturb the jasmine crosses. Reproductive barriers are commonly divided into pre and post-fertilization barriers depending on whether fertilization happens normally.
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How does the sexual life cycle increase the genetic variation in a species?
By increasing gene stability
By allowing fertilization
By allowing crossing over
By conserving chromosomal gene order
By decreasing mutation frequency
note: the cirled answer might be right or wrong
Some organisms are capable of asexual or sexual reproduction. Under favorable conditions, reproduction proceeds asexually. When conditions become more stressful reproduction switches to a sexual mode. Why?
Question options:
Sexual reproduction is simple and more rapid allowing larger numbers of offspring to be produced.
Sexual reproduction requires two separate individuals, who can mutually provide nutrient support during stress.
Sexual reproduction produces individuals with new combinations of recombined chromosomes increasing diversity.
Asexual reproduction requires more energy.
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- All of the following are requirements for successful external fertilization except for one. Which one is not a requirement? A moist environment. Large, energy-rich gametes. Synchronization of gamete release. Lock and key recognition between gametes of the same species.arrow_forwardWhich of the following is an advantage of asexual reproduction? (choose all correct answers) decreased potential for adaptation because of genetically uniform populations reproduce without a mate increased genetic diversity offspring have optimal genetics for current environment produce many offspring quicklyarrow_forwardWhich types of environments/conditions would favor sexual reproduction over asexualreproduction in a species? (select all that apply) Group of answer choices A species that is rapidly expanding into new environments. A species that has accumulated many deleterious mutations An environment that is stable and favorable An environment where a pathogen of a species is rapidly diversifyingarrow_forward
- Most eukaryotic organisms use sexual reproduction as their primary means of perpetuating their species. Gametes are formed via meiosis. However, some species primarily reproduce via asexual means. Reproduction is accomplished via mitosis. Aspen trees most commonly reproduce by such asexual methods of cloning.What are the advantages and disadvantages of reproduction by asexual means? Why do some species reproduce in this manner? Why don't all species?arrow_forwardWhich of the following best describes the role of recombination in genetic variation? Group of answer choices It ensures that each gamete receives one copy of each chromosome It allows for randomly shuffling alleles during gamete formation It involves the exchange of genetic material between non-homologous chromosomes It creates new combinations of alleles on the same chromosome during crossing overarrow_forwardMultiple choice:which of the following are disadvantages of sexual reproduction? Requires more timeRequires more energy to be expended during courtship Favorable gene combo are broken up Allows for the removal of bad genetic combinationsarrow_forward
- Explain well please, asaparrow_forwardhich of the following is least likely to produce genetic variation in the offspring of an individual? a cross over event during meiosis that creates a new combination of alleles in the gametes a DNA replication error caused by DNA polymerase in a body cell of the individual the random fertilization of an egg cell by a sperm cell during sexual reproduction independent assortment of chromosomes during meiosis that creates a new combination of alleles in the gametesarrow_forwardOffspring that result from sexual reproduction are genetically different from their parents and from one another because of independent assortment of chromosomes, crossing over and random fertilization. Select one: True Falsearrow_forward
- These organisms alternate between a multicellular haploid generation (or, phase) and a multicellular diploid generation (or, phase). Group of answer choices plants neither animals botharrow_forwardWhen you put the two coins that are flipped together, you are simulating what part of the process of sexual reproduction? independent assortment random fertilization meiosis segregation of allelesarrow_forwardSelect the correct phrases: (Prezygotic barriers / Postzygotic barriers) are reproductive isolating mechanisms that occur after a zygote has been formed. An example would be (an infertile hybrid / gametes that cannot fuse).arrow_forward
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