Question

which of the following was a reason morgan studied fruit flies? he chose them because fruit flies often mate prolifically. he chose them because fruit flies have unrecognizable traits. he chose them because fruit flies have only one gender. he chose them because fruit flies have 32 chromosomes.

Explanation:

• For the option "He chose them because fruit flies have unrecognizable traits", fruit flies have distinct and recognizable traits (like eye color, wing shape), so this is incorrect.
• For the option "He chose them because fruit flies have only one gender", fruit flies have two genders (male and female), so this is wrong.
• For the option "He chose them because fruit flies have 32 chromosomes", fruit flies have 8 chromosomes (4 pairs), so this is incorrect.
• For the option "He chose them because fruit flies often mate prolifically", fruit flies have a short generation time and mate frequently, producing many offspring, which is a valid reason for using them in genetic studies.

Answer:

A. He chose them because fruit flies often mate prolifically.