Page 11 18. Parthenogenesis is most likely to be common in environments with a A warm climate and low parasite density B warm climate and high parasite density C cool climate and low parasite density D cool climate and high parasite density. 19. Asexual reproduction is most likely to be a successful reproductive strategy in A wide, stable niches B narrow, stable niches C wide, unstable niches D narrow, unstable niches. 20. The black grouse male is larger and more brightly coloured than the female and competes with other males at leks. Which of the following pairs of features are characteristic of this species? A Monogamy and sexual dimorphism B Monogamy and reversed sexual dimorphism C Polygamy and sexual dimorphism D Polygamy and reversed sexual dimorphism 21. Which of the following conversions is catalysed by reverse transcriptase? A RNA → DNA B RNA → protein C DNA → RNA D DNA → protein [Turn over