Assignment 3- role of altruism in the evolution of eusocial organisms such as ants, bees, wasps and my personal favorite, naked Earlier we discussed altruism, inclusive fitness and the effects of kin selection. Now we want to investigate the offspring, 2) cooperative brood care, and 3) castes (i.e. classes of individuals) that are non-reproductive. In mole rats! Eusocial systems are characterized by three factors: 1) overlap in generations between parents and eusocial species, especially eusocial insects, the worker castes typically do not reproduce, but rather spend their extreme form of altruism. As with sexual selection, Darwin recognized that eusocial insects (and other animals) lives caring for the colony, including the eggs and the young produced by the queen. Eusociality is in essence an posed a severe challenge for his theory of evolution by natural selection. Let's first consider the evolution of eusociality in some Hymenoptera (ants, bees and wasps). A single ant colony may contain millions of individuals, making up several castes that perform different roles (workers, soldiers, and this system, males are haploid and females are diploid. How is this possible? Simple. Males develop from reproducers). In the hymenoptera, an unusual system of sex determination, called haplodiploidy, has evolved. In unfertilized eggs, and females develop from fertilized eggs. In other words, males contain only chromosomes from hypothesized that the existence of haplodiploidy in Hymenoptera may have predisposed many of them to eusociality. the evolution of eusociality. Part 1. Coefficient of Relatedness Question 1: Given the following diagram of haplodiploidy, calculate the coefficient of relatedness for each of the colony member pairs listed. Sisters to sisters = Mother (diploid) 1 Father (haploid) Sisters to brothers = Females to offspring = 1/2 Sister 112 Brother Arrows describe paths by which genes can be identical by descent. Question 2: Given the relatedness of sisters you calculated above, would females maximize their inclusive fitne by acting as workers (i.e., caring for their sisters that the queen produces), or reproducing on their own? Why? Question 3: Given their relatedness to sisters versus brothers, would female workers in an ant colony be m kely to care for male or female young? Why?
Assignment 3- role of altruism in the evolution of eusocial organisms such as ants, bees, wasps and my personal favorite, naked Earlier we discussed altruism, inclusive fitness and the effects of kin selection. Now we want to investigate the offspring, 2) cooperative brood care, and 3) castes (i.e. classes of individuals) that are non-reproductive. In mole rats! Eusocial systems are characterized by three factors: 1) overlap in generations between parents and eusocial species, especially eusocial insects, the worker castes typically do not reproduce, but rather spend their extreme form of altruism. As with sexual selection, Darwin recognized that eusocial insects (and other animals) lives caring for the colony, including the eggs and the young produced by the queen. Eusociality is in essence an posed a severe challenge for his theory of evolution by natural selection. Let's first consider the evolution of eusociality in some Hymenoptera (ants, bees and wasps). A single ant colony may contain millions of individuals, making up several castes that perform different roles (workers, soldiers, and this system, males are haploid and females are diploid. How is this possible? Simple. Males develop from reproducers). In the hymenoptera, an unusual system of sex determination, called haplodiploidy, has evolved. In unfertilized eggs, and females develop from fertilized eggs. In other words, males contain only chromosomes from hypothesized that the existence of haplodiploidy in Hymenoptera may have predisposed many of them to eusociality. the evolution of eusociality. Part 1. Coefficient of Relatedness Question 1: Given the following diagram of haplodiploidy, calculate the coefficient of relatedness for each of the colony member pairs listed. Sisters to sisters = Mother (diploid) 1 Father (haploid) Sisters to brothers = Females to offspring = 1/2 Sister 112 Brother Arrows describe paths by which genes can be identical by descent. Question 2: Given the relatedness of sisters you calculated above, would females maximize their inclusive fitne by acting as workers (i.e., caring for their sisters that the queen produces), or reproducing on their own? Why? Question 3: Given their relatedness to sisters versus brothers, would female workers in an ant colony be m kely to care for male or female young? Why?
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Transcribed Image Text:Assignment 3-
role of altruism in the evolution of eusocial organisms such as ants, bees, wasps and my personal favorite, naked
Earlier we discussed altruism, inclusive fitness and the effects of kin selection. Now we want to investigate the
offspring, 2) cooperative brood care, and 3) castes (i.e. classes of individuals) that are non-reproductive. In
mole rats! Eusocial systems are characterized by three factors: 1) overlap in generations between parents and
eusocial species, especially eusocial insects, the worker castes typically do not reproduce, but rather spend their
extreme form of altruism. As with sexual selection, Darwin recognized that eusocial insects (and other animals)
lives caring for the colony, including the eggs and the young produced by the queen. Eusociality is in essence an
posed a severe challenge for his theory of evolution by natural selection.
Let's first consider the evolution of eusociality in some Hymenoptera (ants, bees and wasps). A single ant colony
may contain millions of individuals, making up several castes that perform different roles (workers, soldiers, and
this system, males are haploid and females are diploid. How is this possible? Simple. Males develop from
reproducers). In the hymenoptera, an unusual system of sex determination, called haplodiploidy, has evolved. In
unfertilized eggs, and females develop from fertilized eggs. In other words, males contain only chromosomes from
hypothesized that the existence of haplodiploidy in Hymenoptera may have predisposed many of them to
eusociality. the
evolution of eusociality.
Part 1. Coefficient of Relatedness
Question 1: Given the following diagram of haplodiploidy, calculate the coefficient of relatedness for each of the
colony member pairs listed.
Sisters to sisters =
Mother
(diploid)
1
Father
(haploid)
Sisters to brothers =
Females to offspring =
1/2
Sister
112
Brother
Arrows describe paths by which
genes can be identical by descent.
Question 2: Given the relatedness of sisters you calculated above, would females maximize their inclusive fitne
by acting as workers (i.e., caring for their sisters that the queen produces), or reproducing on their own? Why?
Question 3: Given their relatedness to sisters versus brothers, would female workers in an ant colony be m
kely to care for male or female young? Why?
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