Passage III
The characteristics and genetics of D. pseudoobscura (a species of fruit fly) have been studied extensively. Table 1 shows the average egg production of different races and strains of female D. pseudoobscura at various temperatures throughout their lifetimes.
Table 2 shows the results of a study on testis length in male D. pseudoobscura with different combinations of Race A and Race B chromosomes. Male D. pseudoobscura have one X chromosome, one Y chromosome, two Number 2 chromosomes, two Number 3 chromosomes, and two Number 4 chromosomes.
13. According to Table 2, individuals within which of the following groups had the greatest number of Race B chromosomes?
Your Answer is
Correct Answer is B
Explanation
Look at the Group 10-18 corresponding to Race B in table 2, the highest height is 530 μm, corresponding to Group 12 and Group 14