PLEASE HELP ASAP 2.) A person with Down syndrome has an extra copy of chromosome 21. What can you infer is most likely the genetic mutation that results in Down syndrome?

Nondisjunction during meiosis
Complete duplication of chromosomes during polyploidy
Translocation during genetic replication
Crossing over during meiosis

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

the correct answer is d

it's d - life cycles - apex