Which of these describe how a chromosomal'mutation may occur during meiosis? Select all that apply.
Two homologous chromosomes do not separate properly during meiosis I.
O Sister chromatids are pulled apart into four separate chromatids during meiosis
II.
Sister chromatids fail to separate during meiosis II.
Homologous chromosomes separate from each other during meiosis I.

helicase, i think thats it

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.