Crossing over is a process which contributes to diversity in offspring of an organism. Which statement BEST explains this process?

During metaphase II, sister chromatids of a homologous pair exchange genetic information.

A sister chromatid from one homologous pairs switches places with a sister chromatid from a different homologous pair.

Homologous chromosomes exchange genetic information during prophase I
Sister chromatids separate to form haploid cells during anaphase II
Q

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

Has anyone taken the genetics unit test in connexus? not looking for answers, just a little bit what to expect and some with studying.

Northern switzerland has a fairly cold climate caused by sea winds from the atlantic ocean but souther switzerland tends to be much warmer and sunnier, what could cause this difference?