BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 17, Problem 3SA
Match the modes of natural selection with their best description.
| ____ stabilizing | a. eliminates extreme forms of a trait |
| ____ directional | b. eliminates midrange forms of a trait |
| ____ disruptive | c. shifts |
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People who are heterozygous for the cystic fibrosis gene are morelikely than others to survive a cholera epidemic. This heterozygoteadvantage seems to explain why homozygotes are maintained in thehuman population, and is an example ofa. disruptive selection.b. balanced polymorphism.c. high mutation rate.d. nonrandom mating.
For natural selection to occur, there must be competition for resources, competition for survival, or 15) different reproductive success. Why is this so?
A) Without competition, there is no pressure to mutate.B) The struggle of competition makes individuals stronger.C) Natural selection acts on the different abilities of individuals to survive and pass on their
genes to the next generation.D) Populations evolve to preserve the species and don't change unless they must.
Then explain why the answer is correct and why the others one are inccorect.
which of these is not a central rule of natural selection
a, fitness to the general health and strength of an organism
b, natural selection can only act on traits that affect reproduction
c, natural selection can't occur without population variation
d, a trait must be inherited if natural selection is to act on it
Chapter 17 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Ch. 17 - _________is the original source of new alleles. a....Ch. 17 - Prob. 2SACh. 17 - Match the modes of natural selection with their...Ch. 17 - Prob. 4SACh. 17 - The persistence of the sickle allele at high...Ch. 17 - Prob. 6SACh. 17 - Prob. 7SACh. 17 - Which of the following is not part of how we...Ch. 17 - Prob. 9SACh. 17 - Prob. 10SA
Ch. 17 - Prob. 11SACh. 17 - Prob. 12SACh. 17 - In evolutionary trees, each node represents an...Ch. 17 - Match the evolutionary concepts. ____gene flow a....Ch. 17 - The evolution of wings helped the insect clade to...Ch. 17 - Species have traditionally been characterized as...Ch. 17 - Rama the cama, a llama-camel hybrid, was born in...Ch. 17 - Two species of antelope, one from Africa, the...Ch. 17 - Prob. 4CT
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Which of the following statements about natural selection is a misconception? a.Most species don't produce more offspring than the environment can support b.Natural selection acts on heritable variations in a population c.Natural selection involves differential reproductive success d.Natural selection occurs as a result of competition among individuals in a population e.In natural selection, traits that are favoured depend on current environmental conditionsarrow_forwardIf a polymorphism is found at a low frequency globally, but has a high frequency in a particular population, this indicates that: A. natural selection has shaped the distribution of that trait. B. it may have been caused by genetic drift. C. a lack of gene flow affected its distribution. D. All of the above. E. None of the above..arrow_forwardUnlike natural selection, is not related to an individual’s ability to survive and may result in offspring that are less well adapted to survive in a particular environment. (a) genetic drift (b) sexual selection (c) directional selection (d) convergent evolutionarrow_forward
- A change in one or more characteristics of a population that is heritableand occurs from one generation to the next is calleda. natural selection.b. sexual selection.c. population genetics.d. evolution.e. inheritance of acquired characteristics.arrow_forwardWhich of the following is not a trait on which natural selection can act? a size of ears b fur/hair color c broken bones d thickness of furarrow_forwardWhich of the following is not true of natural selection?(a) natural selection acts to preserve favorable traits and eliminate unfavorable traits (b) the offspring of individuals that are better adapted to the environment will make up a larger proportion of the next generation (c) natural selection directs the course of evolution by preserving the traitsacquired during an individual’s lifetime (d) natural selection Test Your Understanding acts on a population’s genetic variability, which arisesthrough mutation (e) natural selection may result in changes in allele frequencies in a populationarrow_forward
- One way for disruptive selection to occur is ifa. the population contains diversity.b. the environment contains diversity.c. pollution is present.d. natural selection occurs.e. All of these are correct.arrow_forwardOne of the original Amish colonies rose from a ship of colonists that came from Europe. The ship’s captain, who had polydactyly, a rare dominant trait, was one of the original colonists. Today, we see a much higher frequency of polydactyly in the Amish population. This is an example of: a. natural selection b. genetic drift c. founder effect d. b and carrow_forwardThe modes of natural selection differ based on how selection acts on the _____ of a population. a color b environment c genotypes d phenotypesarrow_forward
- With stronger natural selection, was the more beneficial allele lost from these small populations?a) It was lost very frequently, and the strength of natural selection did not make any difference.b) It was never lost.c) It was lost a few times, but not very often, and it was lost less frequently under strong selection.d) It was lost a few times, and it was lost more frequently under strong selection.arrow_forwardNatural selection changes allele frequencies because some _________ survive and reproduce better than others. (A) alleles (B) loci (C) species (D) individualsarrow_forwardgentic drift is A. genetic change in an indivdual's lifetime b genetic change over time c. The change in genetic composition of populations over time d. Evolution that happens on a indvidualarrow_forward
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