(CHOOSE ALL THAT APPLY FOR ALL QUESTIONS) 1. Consider the scenario and then answ
ID: 258651 • Letter: #
Question
(CHOOSE ALL THAT APPLY FOR ALL QUESTIONS)
1. Consider the scenario and then answer the question. A gecko species from the tropical habitat (hot, wet and humid) invades the desert of the Unites States where the climate is hot and dry. 20 years later, researchers examined individual Geckos from the desert populations and found that their ability to conserve water (a physiological trait) was different from individual Gecko in tropical regions . The researchers found that the offspring of the desert population had the same physiological trait as their parents. This is an example of (choose all that apply)
a) Transient change in an individual
b) Change in alleles that mediate the trait in question
c) Evolution through natural selection
D) acclimation
e) adaptation
2. Consider a population of butterflies and the alleles responsible for spot patterns. Which of the following statements is TRUE for evolution to proceed. (CHOOSE ALL THAT APPLY)
a) Even though not all individuals will breed, all the alleles in a population (gene pool) are passed down to the next generation
b) Spots must be a heritable trait (at least in part)
c) With respect to the gene pool: if all the males and females had an equal success at survival and breeding, then allele frequencies should not change
d) Natural selection would act to increase the frequency of spots if individuals with spots had equal fitness to individuals without spots
e) If spots are favored in a population, you would expect to see alleles that code for spots to increase in the population
f) the gene pool is composed of all the alleles in a population
5) Sexual selection predicts that if there are an equal number of males and females in a population, then the following are TRUE: (CHOOSE ALL THAT APPLY)
a) there will be tense male-male competition
b) there will be relatively low variations in reproductive success in males
c) Males should be willing to mate with any female
d) There will be high variation in reproductive success in males
e) There will be intense female-female competition
f) There will be relatively low variation in reproductive success in females
Explanation / Answer
A gecko species from the tropical habitat (hot, wet and humid) invades the desert of the Unites States where the climate is hot and dry. 20 years later, researchers examined individual Geckos from the desert populations and found that their ability to conserve water (a physiological trait) was different from individual Gecko in tropical regions . The researchers found that the offspring of the desert population had the same physiological trait as their parents. This is an example of-
b) Change in alleles that mediate the trait in question
c) Evolution through natural selection
e) adaptation
(Note: This is a classic example of adaptation, where individuals of the gecko species having some sort of mutation in the allele associated with the particular trait of water conservation are getting naturally selected and thus developing a particular adaptation, beneficial for survival in desert)
2.
b) Spots must be a heritable trait (at least in part)
e) If spots are favored in a population, you would expect to see alleles that code for spots to increase in the population
f) the gene pool is composed of all the alleles in a population
(Note: Spots are clearly a heritable trait as alleles are responsible for it. In a population, if individuals having spots are favored then the chance of them passing their genes is amplified, hence the alleles coding for spots are also increased. )
5.
c) Males should be willing to mate with any female.
f) There will be relatively low variation in reproductive success in females
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