Question

multiple choice 1 point
meiosis reduces the diploid number of chromosomes by half to prevent the number from _ after sexual reproduction.
decreasing
staying the same
increasing

multiple choice 1 point
inhibitors of microtubule synthesis inhibit mitosis by preventing the formation and function of the:
synaptonemal complex
chromosomes
centrioles
spindle

Explanation:

• For question 2: In sexual reproduction, if meiosis did not halve the chromosome number, when gametes fuse (sperm and egg), the chromosome number would double. Meiosis ensures that the diploid number is maintained in the offspring. So it prevents the number from increasing.
• For question 3: Microtubules form the spindle fibers during mitosis. Spindle fibers are responsible for separating chromosomes. Inhibitors of microtubule synthesis prevent the formation and function of the spindle, thus inhibiting mitosis. The synaptonemal complex is related to meiosis (pairing of homologous chromosomes), chromosomes are the structures with genetic material, and centrioles (in animal cells) organize microtubules but the key structure affected by microtubule inhibitors in terms of mitosis inhibition is the spindle.

Answer:

1. C. increasing
2. D. spindle