What are the three levels through which genomic variation is generated by sexual reproduction?
What will be an ideal response?
Answer: First, each animal generates an enormous variety of gametes from a genome that was itself derived by a near-random combination of chromosomes from two different parents: An animal with 23 pairs of chromosomes can produce more than 8 million different gametes. Second, during meiosis, chromosomal recombinations can generate hybrids of maternal and paternal chromosomes. And third, the diploid offspring produced by fertilization are unique combinations of the variants generated by the first two processes cited above.
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Name the structural levels of the body and briefly describe each level
What will be an ideal response?
Unlike other joints, a ________ does not join two bones to one another.
A. bony joint B. gomphosis C. syndesmosis D. suture E. cartilaginous joint
Which region of the pituitary produces melanocyte-stimulating hormone in fetuses, young children, and pregnant women?
A) hypothalamus B) adenohypophysis C) pars intermedia D) neurohypophysis
Which of the following statements concerning neutrophils and macrophages is false?
A. They both exhibit chemotaxis. B. They both move by amoeboid motion. C. Both are capable of phagocytosis. D. Both release histamine when activated. E. Both can squeeze between cells.