Chat with AIExam 16: Brains and Behavior
Which of the following statements is/are true?
(32) 
VerifiedE
A new altruistic allele arises in a population such that individuals with the allele give up some personal reproduction in order to help their parents raise offspring. Instead of producing six offspring of their own, individuals with the allele produce only three offspring. The parents would also normally produce six offspring, but are able to produce 12 with the help of the altruistic individual. Using Hamilton's rule, determine whether this altruistic allele is likely to increase in frequency in the population. Show your work.
(30) 
Answered by Examlex AI CopilotTo determine whether the altruistic allele is likely to increase in frequency in the population, we can use Hamilton's rule, which states that an altruistic allele will increase in frequency if the benefit to the recipient, weighted by the relatedness of the recipient to the altruist, exceeds the cost to the altruist.
In this scenario, the cost to the altruistic individual is the reduction in personal reproduction, from six offspring to three offspring. This means the cost (c) = 6 - 3 = 3.
The benefit to the recipient is the increase in offspring for the parents, from six to 12, with the help of the altruistic individual. This means the benefit (b) = 12 - 6 = 6.
Next, we need to consider the relatedness (r) between the altruistic individual and the recipients, which in this case is the parents. Since the altruistic individual shares 50% of their genes with their parents, the relatedness (r) = 0.5.
Now we can use Hamilton's rule, which is expressed as rb > c. Plugging in the values, we get:
0.5 * 6 > 3
3 > 3
Since 3 is not greater than 3, the altruistic allele is not likely to increase in frequency in the population based on Hamilton's rule. This means that the cost of reduced personal reproduction outweighs the benefit to the recipients, taking into account the relatedness between the altruistic individual and the recipients. Therefore, the altruistic allele is not likely to spread in the population.
Which of the following is an example in which predators benefit from group living?
(38) VerifiedD
Hamilton argued that altruistic behavior would increase in a population if
(30) What is the coefficient of relatedness of two sisters of eusocial ants, a haplodiploid Hymenoptera?
(29) What do Maynard Smith and Williams argue about group selection?
(42) Describe the two hypotheses related to the evolution of nervous systems in animals. Be sure to include discussion of the sister groups of animals and mention specifically how sponges and ctenophores play a role in each hypothesis. Feel free to sketch a phylogeny for either or both hypotheses if it helps.
(44) Which of the following could be a proximate explanation for the behavior of singing in birds?
(35) Animal groups termed "selfish herds" most often result from what benefit of group behavior?
(43) You are studying crickets and notice that some male crickets produce long songs, while others produce shorter songs. Describe one method that would allow you to determine whether these differences have at least a partial genetic basis.
(38) Which of the following is an example of behavior in plants?
(39) Which of the following is not an ultimate explanation for behavior?
(30) Certain animals can communicate in ways that suggest complex social cognition. Which of the following correctly pairs the animal with its mode of communication?
(29) Which of the following is an example of an innate behavior?
(38) The figure below shows the number of predatory attacks per individual in water skater groups of different sizes. The information in the graph demonstrates which benefit of grouping? 
(37) What do(es) the following figures suggest about learning in Drosophila flies? 
(19) 
Filters
- Essay(0)
- Multiple Choice(0)
- Short Answer(0)
- True False(0)
- Matching(0)