Which statements describe crossing over? increases genetic variation across gametes occurs between homologous chromosomes separates chromosome pairs into gametes occurs between duplicated sister chromatids

increases genetic variation across gametes

occurs between homologous chromosomes

Explanation:

Crossing over is the exchange of chromosomal segments between homologous chromosomes during prophase I of meiosis. The process occur after the formation of bivalents/tetrads as a result of synapsed homologous chromosomes.

The exchange of chromosomal segments ensures that resulting meiotic gametes are genetically different from their parents, a phenomenon known as genetic variation.

Hence, the two statements out of the options that describe crossing over are:

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d