BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 40, Problem 1CT
Summary Introduction
To determine:
The role of natural selection and sexual selection in case of male guppies whose habitat has been changed and resulted in the development of more colorful male guppies.
Introduction:
Natural selection is the mechanism of evolution in which species adapt to their environment. The most suited individuals have better chances of survival than others which do not adapt to the environment. Sexual selection is the mode of natural selection. It defines that few individuals in the population out-reproduce other individuals due to their characteristics.
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Is sexual selection or natural selection the driver for the differences between males and females?
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Robins typically lay four eggs. Four eggs allow the offspring to be well fed, whereas larger clutches may result in malnourished chicks that have a lower chance of survival. Fewer than four eggs per clutch may result in no surviving offspring if the eggs are preyed upon. Which type of pattern of natural selection MOST LIKELY acts to keep four eggs the most common clutch size?
Darwin’s finches have different beaks in terms of size and shape to be able to eat different food sources like insects, nectar, and seeds. Cactus finches have longer, more pointed beaks to probe cactus flowers compared to their relatives, the ground finches.
If a plant disease killed a large portion of the cacti on the Galapagos islands, what would the future populations of finches look like in terms of beak size and shape? Use your knowledge of natural selection to determine which option is most likely.
Ground finches would survive and pass on their shorter and wider beaks, so there would be a higher proportion of finches in future generations that have short and wide beaks.
Ground finches would survive and pass on their beaks, but they would mate with the remaining cactus finches, creating a new hybrid that is somewhere between short versus long and narrow versus wide.
Cactus finches would compete for food with ground finches and exhibit resource partitioning, so the beaks…
Chapter 40 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Ch. 40 - Most commonly, individuals of a natural population...Ch. 40 - The rate at which population size grows or...Ch. 40 - Suppose 200 fish are marked and released in a...Ch. 40 - Prob. 4SACh. 40 - For a given species, the maximum rate of increase...Ch. 40 - _______ is a density-independent factor that...Ch. 40 - Prob. 7SACh. 40 - Prob. 8SACh. 40 - Compared to the less developed countries, the...Ch. 40 - An increase in infant mortality will _______ a...
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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
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