Which of the following is NOT true of homologous chromosomes:

they are members of the same chromosomal pair

they can undergo crossing over during meiosis

separate during meiosis

do not separate during meiosis

do not separate during meiosis

Explanation: A homologous chromosome is a pair of chromosome of approximately the length that is usually located on the same locus. Each human body cell contains 23 pairs of chromosomes or a total of 46 chromosomes and each of the 23 pairs is a homologous chromosome. During meiosis, the two chromosomes in every pair separate giving rise to a gamete with haploid number of chromosomes, that is gametes having half the number of chromosomes as the parent cell. The gametes (sperm and egg) have a single set of chromosomes, that is a total of 23 chromosomes.

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.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?