In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Question: When does exchange of dna segments happen between non-sister chromatids of homologous chromosomes? Answer: during crossing-over
Exchange of dna segments happens between non-sister chromatids of homologous chromosomes during crossing-over.

Question: What type of animal in the sea spend most of their lives as medusae? Answer: jellyfish
Jellyfish type of animal in the sea spend most of their lives as medusae.

Question: What is the term for an antibody that inappropriately marks self-components as foreign? Answer: autoantibody

Autoantibody is the term for an antibody that inappropriately marks self-components as foreign.