Question

_____18. In bird and mammal species, females are more ___________ and males are more ________.

            A. K – selected, R - selected

            B. R – selected, K - selected

_____19.  Mating behavior would be described as __________ while social mating behavior is be described as___________.

A. behavior leading up to and including copulation; behavior lasting after copulation, until

     their young are raised and sometimes beyond

            B. behavior during mate attraction; behavior during copulation

            C. shaped only by natural selection; shaped only by sexual selection

_____20. The prevalence of the social mating behavior termed monogamy in some bird and mammal species

         seemed a puzzle to Darwin because:

            A. males can only secure better reproductive success by mating with more than one female.

            B. females should generally prefer to mate with several males, not one, in order to increase

                her chances of securing some exceptional genes for her offspring.

            C. males generally have sufficient sperm to fertilize a great many eggs, which ought to favor                   

               males that mate with a great many females.

Answer 1

Q 18 A) In bird and mammal species, females are more K-selected and males are more R-selected.

because, male sperms are considered week and produced in large amount while female produce less egg which are resource/nutrient rich. hence male are considered as r-selected and female as k-selected.

Q 19 A) Mating behavior would be described as behavior leading up to and including copulation while social mating behavior is be described as behavior lasting after copulation, until their young are raised and sometimes beyond

Q20 The prevalence of the social mating behavior termed monogamy in some bird and mammal species seemed a puzzle to Darwin because: A. males can only secure better reproductive success by mating with more than one female.

Because according to darwin for sexual selection males in a population should experience proportionate reproductive success. i.e some male may be successful in mating while some males are successful in fertilizing the ova. therefore for proper sexual selection by female the male should proportionate both successful mating and fertization of ova post-mating