Evolution based questions I need help on answering. Thank you! In the social bir

Question

Evolution based questions I need help on answering. Thank you!

In the social bird system of many corvids (crows, jays) relatives are known to assist in offspring. The cost of assisting (C)is measured as 1.1 offspring per assistant. The benefit for the recipient (B) is measured as 4.5 offspring per assistant. According to inclusive fitness theory indicate in which group listed below altruistic behavior be expected to evolve. (TRUE for expected to evolve, FALSE for not expected to evolve) rearing 24. Half-siblings a. TRUE b. FALSE 25. First cousins a. TRUE b. FALSE 26. Full siblings a. TRUE b. FALSE 27. All of the following characteristics define eusociality except: a. Cooperative brood care b. Haplodiploid sex determination c. Overlap in generations between parents and offspring d. Specialized castes of non-reproductive individuals 28. What is it about haplodiploid sex determination that makes altruism (and eusocialit y) more likely to evolve? a. Brother-sister coefficient of relatedness is low b. Daughter-mother coefficient of relatedness is low c. Mother-offspring coefficient of relatedness is high d. Sister-sister coefficient of relatedness is high 29.I have no father and will never have sons. What am 1? a. Female ant b. Male bee c. Stalk-eyed fly d. Sad beetle 30. A typical s ex ratio observed in hymenopteran ant and bee colonies that supports the inclusive fitness theory of the evolution of altruism is: a, 25% female, 75% male b, 50% female, 50% male C. 75% female, 25% male d, 99% male, one queen

Explanation / Answer

Ususally, genes increase in frequency when

rB> C

where,

r is the genetic relatedness of the recipient

B is the benefit gained by the recipient

C is the reproductive cost to the individual performing the act

24) True

for half siblings,

coefficient of relationship?, r = 0.25

therefore rB = 0.5 * 4.5 = 1.125

this value is greater than C = 1.1

Hence altruistic behavior will evolve

25) False

for first cousins,

coefficient of relationship?, r = 0.125

therefore rB = 0.5 * 4.5 = 0.5625

this value is less than C = 1.1

Hence altruistic behavior will not evolve

26) True

for full siblings,

coefficient of relationship?, r = 0.5

therefore rB = 0.5 * 4.5 = 2.25

this value is greater than C = 1.1

Hence altruistic behavior will evolve

27) of the following haplodiploid sex determination is not a characeristic of eusociality.

In Haplodiploid sex-determination system, males develop from unfertilized eggs and are haploid, and females develop from fertilized eggs and are diploid.?This phenomenon is seen only in insects belonging to order Hymenoptera?.

Eusociality is seen insects, crustaceans and mammals and not restricted to insects of this order. Hence, this haplodiploidy is not a characteristic of eusociality.

28) D

In haplodiploid sex determination the sister-sister coeffecient of relatedness is high, i.e.0.75. Hence the altruistic behaviour evolves in organisms that follow this system.

29) B - male bees

Bees which belong to the order hymnoptera follow the haplodiploid sex determination system. In this system, males develop from unfertilized eggs and are haploid, and females develop from fertilized eggs and are diploid. Hence males in these insects have no father and never have sons

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.