The exchange of segments of chromatids during synapsid is known as

answer:

crossing over

explanation:

the tight pairing of the homologous chromosomes is called synapsis. in synapsis, the genes on the chromatids of the homologous chromosomes are precisely aligned with each other. an exchange of chromosome segments between non-sister homologous chromatids occurs and is called crossing over.

answer: crossing over

explanation:

the tight pairing of the homologous chromosomes is called synapsis. in synapsis, the genes on the chromatids of the homologous chromosomes are precisely aligned with each other. an exchange of chromosome segments between non-sister homologous chromatids occurs and is called crossing over.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.