EBK BIOLOGY
4th Edition
ISBN: 8220102797376
Author: BROOKER
Publisher: YUZU
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Chapter 25, Problem 3TY
Summary Introduction
Introduction: The form of reproductive isolation that prevents the process of fertilization is called a prezygotic isolation method. Whereas, the method that does not allow the production of fertile offspring is called postzygotic isolation mechanism.
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Members of two separate species mate and produce hybrid offspring that fail to thrive in the environment. The hybrid genotypes do not suit the hybrid organism for survival using any given niche. Eventually, the hybrid genotypes disappear from the environment. This would be due to:
A. hybrid inviability
B. hybrid sterility
C. gametic incompatibility
D. pre-zygotic isolation
E. infra-gametic disruption
The phenomenon of ____ results from the unequal size of the male and female gametes and the markedly different amounts of parental investment in the resulting offspring. As a result of this phenomenon, females tend to be the choosier sex in most vertebrate species.
A.
anisogamy
B.
isogamy
C.
isostacy
D.
pleiotropy
E.
heterogeneity
We learned from hermaphroditic snails in New Zealand and C. elegans that populations that are undergo both sexual and asexual reproduction in the same population can alter the frequency of outcrossing resulting in changes in genetic diversity. Identify the statement that accurately reflects a real result.
a.
Sexual reproduction prevents the ability of snails and worms to coevolve with their parasites.
b.
Sexual reproduction frequency increases in the presence of a stressor, like pathogens and parasites.
c.
Asexual reproduction is favored when there are pathogens and parasites in the environment.
d.
Asexual reproduction enables the Red Queen hypothesis to play out and enable the pathogen to win.
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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- Which of the following assumptions is NOT part of Hardy-Weinberg principle? a. no geneflow b. no mutation c. Allelic frequencies are the same in males and females d. mating is nonrandomarrow_forward2) In some Drosophila species, conditions in the female reproductive tract do not allow the sperm of other species to survive long enough for fertilization to occur. What mechanism of reproductive isolation is in operation in this example? a.Temporal isolation. b.Mechanical isolation. c.Low hybrid viability. d.Gametic isolation.arrow_forward17) Imagine the recessive allele of gene B above is a beneficial trait for individuals of the species to have, but the recessive allele of the C gene is detrimental. Imagine also, you only have two individuals from which you wish to build a successful population: one is homozygous dominant for the two genes and the other homozygous recessive for the two genes. Considering the table of recombination rates above, if you mate these two individuals, what percentage of the resulting offspring will have both beneficial alleles? 18) Theoretically speaking, we should not be able to observe a recombination rate greater than 50%. Why is this so? If we measure a recombination rate of 50% what does it mean? 19) Create a chromosome linkage map for the seven genes provided. Numbers represent the recombination rates among offspring who have parents who are each pure-bred for the alleles of genes described. Assuming the gene for eye color is 25 map units from the end of the chromosome, provide a list…arrow_forward
- experiments followed from mendals cross and developed from the conclusions he made as a result of the first monohybrid cross. State what ratio of offspring he would have predicted from these crosses. b Calculate the actual ratios obtained in each of these crosses. c Suggest what chance events may influence the actual ratios of offspring obtained in breeding experiments like these. (We will return to this issue at a later point. For example, the statistical test known as the chi-squared test can be applied to the results of genetic crosses to test whether the actual results are close enough to the predicted results to be significant.)arrow_forwardBlue snorks are dominant to pink snorks. You come across a field of all blue snorks and mate them with a pink snork. The resulting progeny are all blue again. What are the most likely genotypes of the snorks from the field? Select one: a. Heterozygous for the dominant allele. b. Homozygous for the dominant allele. c. Homozygous for the recessive allele.arrow_forwardIn a diploid species, each individual possesses (a) one allele for each locus (b) two alleles for each locus (c) three or more alleles for each locus (d) all the alleles found in the gene pool (e) half of the alleles found in the gene poolarrow_forward
- Identify the most accurate statement about population variation. a. Allopolyploidy occurs when chromosomes fail to separate during gametogenesis and then self-fertilization results in a tetraploid offspring. b. Chromosomal duplications and deletions cause large changes due to the changes in gene dosage. c. Traits that are influenced by both environment and genetics are unlikely to be influenced by evolution. d. Gene duplications and deletions occur frequently during equal crossing over that occurs during meiosis I.arrow_forwardAssume you are studying development in two species of iguana. You determine that a certain gene, "SPN2" turns on and off at different times in the two different species. The difference in timing leads to a different body length between the two iguana species. This phenomenon is an example of which of the following terms? a. Punctuated Equilibrium b. Pleiotropy c. Gene duplication d. Heterochronyarrow_forwardA. Direction: For each of the five examples below, give the name of the isolating mechanism and specify if it is prezygotic or postzygotic isolation. a. In some bee population, only large bees are big enough to unfold flower petals and obtain nectar and pollen. b. A cross between two fish species occurs but development only occurs up to 16-cell stage. c. In drosophila, when sperm form one species enters the other species, the sperm is immobilized and unable to fertilized egg. d. Fireflies have a unique lighting pattern. The frequency of lighting is species specific. Fireflies in the same area will not mate with those having a different lighting frequency. e. Two species of butterflies are found in northern Michigan, but one species is found only near rivers and streams, the other near lakes. B. Read analyze the statements given below. Then, justify your answer. a. A common farming practice is to breed a female horse with a male donkey. The result is a very robust animal – the mule.…arrow_forward
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