EBK BIOLOGY
4th Edition
ISBN: 8220102797376
Author: BROOKER
Publisher: YUZU
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Chapter 25, Problem 4TY
Summary Introduction
Introduction: The hybrid breakdown refers to the reproductive failure, in which, an organism may be viable and fertile but their following generations are born with reduced genetic viability and sometimes fatal genetic abnormalities.
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(d)
Scientists believe that the yellow fern arose from hybridization with another fern
on the island. Create a diagram of this hybridization that tracks the origin of the
chromosome number in the yellow fern.
One of the earliest postzygotic barriers to arise is hybrid sterility. Two plants can be crossed, but the resulting seeds grow into sterile plants that cannot reproduce. Is this as important in plants as it is in animals (Hint: How many types of hybrid flowers and fruits are there, compared to hybrid animals)?
n the savannahs of the Amazon different species of the genus Ipomoea are pollinated by either bumblebees or hummingbirds; lavender flowered I. marabaensis and red flowered I. cavalcantei. Which of the follwing data would support the suggestion of natural interspecific hybridization with weak postzygotic isolation?
A.
magenta flowered hybrids found in the wild were infertile and bidirectionally crossing with parental species
B.
magenta flowered hybrids found in the wild were preferentially pollinated by introduced honeybees rather than parental pollinators
C.
In the laboratory, offspring resulting from crosses between I. cavalcantei, I. marabaensis showed a mixture of parental floral characteristics
D.
In the laboratory, offspring resulting from crosses between I. cavalcantei, I. marabaensis and magenta flowered hybrid plants were autotropic and showed hybrid viability
Chapter 25 Solutions
EBK BIOLOGY
Ch. 25.1 - Can you think of another example of two different...Ch. 25.1 - Prob. 1BCCh. 25.1 - Is temporal isolation an example of a prezygotic...Ch. 25.1 - Prob. 3CCCh. 25.2 - Prob. 1BCCh. 25.2 - Prob. 1EQCh. 25.2 - Prob. 2EQCh. 25.2 - Prob. 3EQCh. 25.2 - Prob. 1CCCh. 25.2 - Prob. 2CC
Ch. 25.4 - Evo-Devo: Evolutionary Developmental Biology...Ch. 25.4 - Prob. 2CCCh. 25.4 - Prob. 1BCCh. 25.4 - Prob. 3CCCh. 25 - Macroevolution refers to evolutionary changes that...Ch. 25 - Prob. 2TYCh. 25 - Prob. 3TYCh. 25 - Prob. 4TYCh. 25 - Prob. 5TYCh. 25 - Prob. 6TYCh. 25 - Prob. 7TYCh. 25 - Prob. 8TYCh. 25 - Prob. 9TYCh. 25 - Prob. 10TYCh. 25 - What is the key difference between prezygotic and...Ch. 25 - What are the key differences between gradualism...Ch. 25 - Prob. 3CQCh. 25 - Prob. 1COQCh. 25 - Discuss the type of speciation (allopatric or...
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- A prezygotic barrier prevents (a) the union of egg and sperm (b) reproductive success by an interspecific hybrid (c) the development of the zygote into an embryo (d) allopolyploidy from occurring (e) changes in allometric growtharrow_forwardDefine the following terms related to alterations of generations: a.Haploid b.Diploidarrow_forward. A geneticist working on a haploid fungus makes a cross between two slow-growing mutants called mossy and spider (referring to the abnormal appearance of the colonies). Tetrads from the cross are of three types (A, B, C), but two of them contain spores that do not germinate.Devise a model to explain these genetic results, and propose a molecular basis for your model.arrow_forward
- Maize is a highly cross-pollinated crop and heterotic phenomenon is evident from the currently available hybrids. If you are given a huge random germplasm pool of maize, what procedure you will adopt to develop competitive high yielding hybrids.arrow_forwardA plant has a genotype AaBb. there is no linkage of the genes. the gametes it will produce are: A) AB and ab B) Aa and Bb C) AA, aa, BB and Bb D) AB, Ab, aB and abarrow_forwardPrezygotic isolating mechanisms prevent hybrid offspring from occurring between species because (a) the resulting offspring are not fertile and cannot reproduce. (b) the egg and sperm fuse and form a zygote, but it does not survive. (c) the egg and sperm do not ever meet or, if they do, cannot fuse to form a zygote. (d) all of the abovearrow_forward
- Interspecific hybrids, if they survive, are (a) always sterile (b) always fertile (c) usually sterile (d) usually fertile (e) never sterilearrow_forwardIn sexually reproducing species, each individual begins life with DNA inherited from both parent organisms. , Apply this idea to what occurs when organisms of two species that have homologous chromosomes mate and produce ( F1 ) hybrid offspring. What percentage of the DNA in the F1 hybrids' chromosomes comes from each parent species? As the hybrids mate and produce F2 and later-generation hybrid offspring, describe how recombination and natural selection may affect whether the DNA in hybrid chromosomes is derived from one parent species or the other.arrow_forwardwhat is not true about hybrids between polar bears and grizzly bears in the wild (select all that apply) A. polar bear grizzly bear hybrids are still rare but are becoming more common b. polar bears are endangered and hybridization is thought to be a mechanism for their survival by adapting with grizzyly bear traits c. Climate change is causing grizzly and polar bears hybrids d. hybrids polar bears do not existarrow_forward
- As the number of generations increases in a population, it would be expected that O a. The number of meiotic recombination events would increase and linkage disequilibrium would decrease O b. The number of meiotic recombination events would decrease and linkage disequilibrium would increase O c. The number of meiotic recombination events would decrease and linkage disequilibrium would decrease O d. The number of meiotic recombination events would increase and linkage disequilibrium would increasearrow_forwardBecause of recombination: a. new alleles are created. b. haplotypes shorten with each generation. c. genetic diversity is decreased. d. female and male phenotypes differ. e. None of the above is correctarrow_forwardIn agriculture, an advantage of triploidy in plants is that the plants area. more fertile.b. often seedless.c. always disease-resistant.d. all of the above.arrow_forward
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