Down syndrome is an abnormality in humans where chromosomes pair 21 has an additional chromosome for a total of 3 chromosomes. Which process leads to Down Syndrome? A. When two chromosomes combine during mitosis
B. When two chromosomes are not replicated properly during mitosis
C. When two chromosomes does not replicate during meiosis
D. When two chromosomes fail to separate during meiosis

What are some possible short and long term medical concerns for crew members on longer space exploration trips

Blood stem cells may develop into any kind of human blood cells. what kind of stem cells are blood stem cells? a. multipotent stem cells o b. totipotent stem cells o c. pluripotent stem cells o d. unipotent stem cells

Hormones are chemical molecules produced by endocrine glands. one such endocrine gland is the thyroid gland, which synthesizes the thyroid hormone, which in turn affects the heart muscles. which two statements describe the probable reason for the function of the hormone? the cells in the heart have specific receptors that allow for the intake of hormones. the heart and the endocrine glands have the exact same types of cells. all cells make the same types of hormones. thyroid hormones show their effect on the heart by means of specialized cells. thyroid cells and cardiac cells have different dna.