The formation of a Barr body
A)
causes the genes on one of the X chromosomes in a female cell to be switched off.
B)
always causes the same X chromosome in a female’s cells to be switched off.
C)
switches on the Y chromosome in a male cell.
D)
none of the above

Which phrase best describes surface currents? 1. up-and-down ocean movement caused by wind 2. waves that hit the shore at an angle and transport sand 3. streams of warm water flowing through the ocean and caused by wind 4. waves that approach the shore and cause their crests to fall into their troughs

If a set of instructions that determines all of the charactersitics of an organism is comparedto a book, and a chromosme is compared to chaper in the book, then what might be compared to a paragraph in the book?

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?