How do scientists analyze pictures of chromosomes to identify the pairs and develop a karyotype? A.)parents
B.)order
C.)color and odor
D.)size and shape​

D) size and shape

Explanation:

they would look for 2 chromosomes that look alike to develop a karyotype

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.