What risks accompany conception for older parents?
What will be an ideal response?
Answer: Children of older parents have a higher risk for Down syndrome, developmental disorders, and mental disorders. Pregnancy in older women can result in hypertension, higher chance of miscarriage, and gestational diabetes.
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The average age at which Americans first have sexual intercourse is
A. 13. B. 15. C. 17. D. 19.
In which of the following ways does the developmental pathway of ?:? T cells differ from that of B cells? (Select all that apply.)
a. Their antigen receptors are derived from gene rearrangement processes. b. When the first chain of the antigen receptor is produced it combines with a surrogate chain. c. Cells bearing self-reactive antigen receptors undergo apoptosis. d. MHC molecules are required to facilitate progression through the developmental pathway. e. T cells do not rearrange their antigen-receptor genes in the bone marrow.
Morphology evaluation of spermatozoa means evaluation of the ________
A) number of sperm B) motility of sperm C) shape of sperm D) size of sperm
A/An ____________________ is any skin growth, such as a wart or callus, in which there is overgrowth and thickening of the skin.?
Fill in the blank(s) with correct word