5. Hybridizations between Japanese rice (Oryza sativa japonica) and Indian rice (Oryza sativa ind result in F1 hybrids that are both healthy and fertile, but when these F1 hybrids are crossed, the resu F2 generation is weak and infertile. This type of reproductive isolation: A. is a post-zygotic barrier known as behavioral F, inferiority B. is a post-zygotic barrier known as F2 hybrid breakdown C. is a post-zygotic barrier known as ecological F, inferiority D. is a post-zygotic barrier known as F1 hybrid sterility E. is a post-zygotic barrier known as Fi hybrid inviability

5. Hybridizations between Japanese rice (Oryza sativa japonica) and Indian rice (Oryza sativa ind result in F1 hybrids that are both healthy and fertile, but when these F1 hybrids are crossed, the resu F2 generation is weak and infertile. This type of reproductive isolation: A. is a post-zygotic barrier known as behavioral F, inferiority B. is a post-zygotic barrier known as F2 hybrid breakdown C. is a post-zygotic barrier known as ecological F, inferiority D. is a post-zygotic barrier known as F1 hybrid sterility E. is a post-zygotic barrier known as Fi hybrid inviability

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter22: Speciation

Section: Chapter Questions

Problem 4TYK: Prezygotic is isolating mechanisms: a. reduce the fitness of hybrid offspring. b. generally prevent...

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1. The western coyote (Canis lupus latrans) can interbreed with the gray wolf (Canis lupus lupus) to produce healthy and fertile F1 hybrids, but these hybrids are usually unable to attract mates (either among themselves, or backcrossed to the western coyote or the gray wolf). This reproductive isolation: A. is a post-zygotic barrier known as behavioral F, inferiority B. is a post-zygotic barrier known as F2 hybrid breakdown C. is a post-zygotic barrier known as F1 hybrid sterility D. is a post-zygotic barrier known as F, hybrid inviability E. is a post-zygotic barrier known as ecological F, inferiority
5. The wood frog (Rana sylvaticus) is unable to breed successfully with the leopard frog (Rana pipiens) because their F1 hybrid offspring die early in embryogenesis. This type of reproductive isolation is: A. best categorized as a post-zygotic barrier known as behavioral F1 inferiority B. best categorized as a post-zygotic barrier known as F2 hybrid breakdown C. best categorized as a post-zygotic barrier known as F, hybrid sterility D. best categorized as a post-zygotic barrier known as F1 hybrid inviability E. best categorized as a post-zygotic barrier known as ecological F; inferiority
1. A male lion (Panthera leo) crossed with a female tiger (Panthera tigris) produces F, hybrid cubs which are called ligers, but these F, ligers (especially males) are typically infertile (as predicted by the British geneticist J.B.S. Haldane). This type of reproductive isolation: A. is a post-zygotic barrier known as behavioral F1 inferiority B. is a post-zygotic barrier known as F2 hybrid breakdown C. is a post-zygotic barrier known as F, hybrid sterility D. is a post-zygotic barrier known as F1 hybrid inviability E. is a post-zygotic barrier known as ecological F, inferiority
Prezygotic is isolating mechanisms: a. reduce the fitness of hybrid offspring. b. generally prevent individuals of different species from producing zygotes. c. are found only in animals. d. are found only in plants. e. are observed only in organisms that reproduce aseually.
2. In the following types of matings, the phenotypes of the parents are listed together with the frequencies of phenotypes occurring among their offspring. Indicate the genotype of each parent (you may need to use testcrossesl). Parents Offspring I B:0 을 A: 을B 을 AB : B: A: 0 를 AB : 를 A a. Вx В Ь. Ох АВ Ox AB Bx A d. Bx A C. TV Sex Lin ko
4. When the F1 bees were backcrossed to the inbred resistant line produced 4 types of offspring in equal numbers: ¼ if the back-cross offspring showed the complete hygienic behavior pattern¼ of the back-cross offspring showed none of the elements of hygienic behavior¼ of the back-cross offspring would uncap the cells of the diseased larvae but these workers would not remove the diseased larvae¼ of the back-cross offspring would remove the diseased larvae (once the experimenter had uncapped the cells of the diseased larvae) a. If the resistant behavioral pattern is due to two gene loci with two alleles each, can this account for the 4 phenotypes shown in the back-cross? How? b. If you use UURR (for the non-resistant inbred line) and uurr (for the resistant inbred line), what are the phenotypic and genotypic ratios for the F2 cross between these lines (i.e., F1 x F1)? Show your work: c. Given the genetic model given in part d, do the backcross offspring in part c (from an F1 x resistant…
2. A sample of 400 individuals is found to contain: 32 A1A1: 36 A1 A2 : 60 A1A3 57 A2A2 : 90 A2A3 : 125 A3A3 a) Find the gene frequencies after one generation of selfing ww b) Find the percent heterozygosity after one generation of selfing. w w c) Find the frequencies of each heterozygous type.
1. The following table gives data for the frequency of genotypes in a population of sunflower plants from a coastal sage scrub community over the course of 50 generations. Gene products of the A allele produce stems without hairs, while gene products of the a allele produce stems with short hairs but flowers with many infertile stamens, and the a' allele produces stems with dense hairs and flowers with all fertile stamens. Note that it may cost the plants greatly in extra carbon to produce these hairs. At the onset of this survey, an invasive insect species that feeds upon the buds of sunflowers had been accidentally introduced into the habitat of this plant population. This insect makes its living by ascending the stems of herbaceous plants rather than landing upon the flower stalks or stems. Thus, dense hairs would impede the ability of this insect to reach the buds. Interpret the results of the data and explain how natural selection might be driving the genotype frequencies in this…
5.Suppose that the same recessive daf-d mutation in the N2 strain landed 20m.u. from the SNP367 locus. You cross homozygous daf-d/daf-d N2 worms to wild type HW worms, and let the hybrid F1 make gametes. How many of the gametes produced by the F1 hybrids will carry a daf-d allele and the N2 allele of SNP367 ? And how many of the gametes will carry a daf-d allele and the HW allele of SNP367? a.40% ; 10% b.20% ; 80% c.50% ; 50% d.80% ; 20% e.10% ; 40%
11. A polygenic trait is also called multiple a. continuous trait holandric gene d. X-link gene b. A plant bearing pink flowers is allowed to pollinate itself. Every generation thereafter, the plant still produces pink flowers. This condition is known as hybridization 12. C. pure breeding a. b. incomplete dominance d. segregation 13. A homozygous red-flowered plant was crossed with a homozygous white-flowered plant and resulted in an offspring with red flowers. This demonstrates a case of dihybrid cross monohybrid cross a. C. b. dominance d. pure breeding How many chromosomes does a human gamete have? 14. 12 a. C. 24 b. 23 d. 46 If a heterozygous tall plant (TI) is crossed with a short plant (t), how many percent of the offspring are heterozygous tall? 15. a. 25% с. 75% b. 50% d. 100% Critical Thinking Are you in favor of the idea that couples should undergo genetic counseling? Why? Explain why Gregor Mendel chose pea plants for his experiments. Albinism is caused by a mutation;…
1. Imagine a gene that causes a rare recessive disease in the mangrove killifish, with the normal allele (A,) very common and the recessive allele (A2) very uncommon (the frequency of A2 = 0.01, and there are only two alleles). са
Name: 2. Some ladybugs have 10 black spots on their shells and some have 4. When true breeding 10 spot individuals are crossed with true breeding 4 spot individuals, the offspring have 7 spots. a. Propose two distinct explanations for this finding. Explain the nature of spot inheritance in each case. D. rew bacteria erred them figure above would of14N7 then ely 2 moldon omrod abitqaq ratlsmmem sge of delw toiisoibom s s neu not oomod aid to soubnup ogusl onomod odi to slevel ismon oouborg o o consu ud od souboini bluow uoy dairlw yd za00oq sdi mialex b. Propose an experiment that would distinguish between these possibilities. sor proieins