Biology: Concepts and Applications (MindTap Course List)
10th Edition
ISBN: 9781305967335
Author: Cecie Starr, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Textbook Question
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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A(n) _____ makes a species better suited to its environment.a. homologous traitb. adaptationc. analogous traitd. mutation
Stabilizing selection on a trait tends toa. make the trait more extreme.b. reduce variability in the trait.c. decrease the frequency of alleles associated with the trait.d. result in elaborate male ornaments.
The modes of natural selection differ based on how selection acts on the _____ of a population.
a
color
b
environment
c
genotypes
d
phenotypes
Chapter 17 Solutions
Biology: Concepts and Applications (MindTap Course List)
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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- 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.arrow_forwardIn the universal ABO blood grouping system, there are four phenotypes—A, B, AB, and O—which are determined by three different alleles. The presence of three alleles in the ABO blood grouping system is an example of ____. a. a polymorphism b. the bottleneck effect c. genetic drift d. a dimorphism e. the founder effectarrow_forwardMeaningful evolution occurs when __________. ○ a heritable trait affects survival and fitness ○ a heritable changed trait gives an organism a fitness advantage ○ a changed trait gives an organism a disadvantage ○ environmental factors changearrow_forward
- Disruptive selection is the promotion of _____. the standard form of a trait human influence a favored extreme trait all extreme forms of a traitarrow_forwardA responsible for anterior morphology in an organism is inherited as maternal effect has two allele: H (normal) and h (a recessive allele that cause small head). A female organism with normal head mates with a true-breeding male with small head. All the offspring have small heads. What should be the genotype of mother and offspring? gene. It a. Mother- Hh, and Offspring- hh b. Mother- hh and offspring Hh c. Mother-hh and offspring- hh d. Mother- hh and offspring- Hharrow_forwardI had trouble with explaining how natural selection affects alllele and genotype frequency. Does natural natural selection affect alleles by causing adaption to happen increasing the frequency of advantageous alleles?arrow_forward
- Which of the following is an example of a vestigial traits? * Wisdom teeth in humans Wings on flightless birds Leg bones in whales All of the above Lenovo esc -> @ %23 2$ % & 1 2 4. 8 9. tab e r y u a d. g. shift m alt altarrow_forwardFor this natural selection story, focus on just ONE GENETIC TRAIT that has two alleles. This is a make-believe story but the story line should sound plausible. Do not involve humans in any way. Once upon a time there was a population of polar bears. Most of the polar bears had/were_(a)___ but a small proportion of the population had/were__(b) ___ Over many generations, the proportion of bears expressing the rare allele became more common through natural selection. What was going on within this population to cause this shift? ___(c)_(very brief is great!) Note: do NOT mention whether the alleles are dominant/recessive nor about individuals being homozygous etc. We are looking at the big picture population-level patterns only.arrow_forwardSexual selection occurs whena. one sex has a higher fitness than the otherb. a species exhibits sexual dimorphismc. there is a male dominance hierarchy and only the alpha male reproduces. d. There is monogamous mating.e. A trait is favored by one sex such that individuals of the opposite sex possessing that trait have an increased likelihood of reproducing.arrow_forward
- Which statements about 2oom in nonadaptive traits are true? (CHECK ALL THAT APPLY) Nonadaptive traits make it less likely that an organism will survive in a particular environment Nonadaptive traits are difficult to pass from generation to generation Nonadaptive traits make it more likely that an organism will survive in a particular tions make eal world. ffect at all. environment Nonadaptive traits are easily passed from generation to generation Wolverinearrow_forward!arrow_forwardArtificial selection works more rapidly than natural selection. T. True Falsearrow_forward
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