Given a scientific passage and an answer, generate a question for the given answer.

Q: Passage: During meiosis, homologous chromosomes separate and go to different gametes. Thus, the two alleles for each gene also go to different gametes. At the same time, different chromosomes assort independently. As a result, alleles for different genes assort independently as well. In these ways, alleles are shuffled and recombined in each parent's gametes. Answer: during meiosis

A: When do homologous chromosomes separate and go to different gametes?
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Q: Passage: The global pattern of precipitation is influenced by movements of air masses. For example, there is a global belt of dry air masses and low precipitation at about 30 N and 30 S latitude. Answer: air masses

A: The global pattern of precipitation is influenced by movements of what?
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Q: Passage: This image depicts a true wonder of nature. This tiny human sperm is penetrating a much larger egg. These two cells will unite to become a brand new human being. The process in which they unite is called fertilization. Answer: fertilization

A:
The process in which a sperm unites with an egg is called?
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