Biology
Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 55.7, Problem 1CS

Core Skill: Modeling The goal of this modeling challenge is to draw a set of bar graphs illustrating the relative body sizes of males and females in different mating systems: monogamy, polygyny, and polyandry. You should be able to explain your graphical model.

Modeling Challenge: Draw a bar graph with three sets of two bars each to illustrate what you think are the relative body-size ratios of males:females in monogamous, polygynous, and polyandrous species, and explain your graph. Scale the y-axis from 0 to 2.0, with 1.0 representing equal body sizes for the two sexes.

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Fitness and Selection: Rodent tails   A researcher is studying a rodent species with a lot of variability in tail length. Individuals may have short tails, medium tails, or long tails. The researcher has noticed that a new invasive predator, which catches prey by their tails as they try to escape, seems to catch individuals with long tails more often than those with short tails. Based on a small field trial, the relative fitness of long-tailed individuals seems to be 0.6 compared to short-tailed ones (1.0), with medium tails in-between (0.8).   Use the Examples tab to predict the outcome after selection for the rodent in regions with the invasive predator. What describes the population after 100 generations of selection? Choose all that apply. A-Short Tailed individuals are the most common phenotype. B-Short Tailed individuals are the only phenotype. C-This is an example of disruptive selection. D- The long tailed phenotype is no longer present  E-This is an example of directional…
please help with these two questions: 1.  iven what we understand about social structure, which type of social structure is generally associated with low levels of sexual dimorphism and high levels of paternal investment among animals in the wild? a. One male b. Monogamy c. Multiple male d. Polyandry e. Solitary 2.  Processes such as random genetic drift and founder effect can dramatically transform the genetic structure of a human group within relatively short periods of time because they can significantly reduce the effective breeding population so that the frequencies of certain genes are amplified. a.True b.False
Please answer fast 2. The black-backed jackal lives in the brushland of Africa, where monogamous pairs defend territories, hunt cooperatively, and share food. Frequently, offspring from the previous year's litter help rear their parents' new pups by regurgitating food for the lactating mother and for her young. It turns out that the number of surviving pups increases an average of 1.5 for every helper, compared to only 0.5 pups surviving when raised by the parents alone.   A. The recruitment of previous offspring to help raise new pups is called:    B. Why would young jackals forego their own breeding to help their mother raise new pups? Explain your answer in the context of Hamilton's Rule.  C. Young jackals that help their parents raise new pups usually have increased reproductive success and/or direct fitness later in life. Provide two potential explanations for this effect.
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