Why is color blindness more common in males? What will be an ideal response?
ANSWER: Color blindness is an X-linked trait, which means the gene controlling color vision is on the
X chromosome. You will recall from earlier chapters that human females have two X
chromosomes while human males have only one. As a result, if the male receives the X
chromosome with the faulty allele, he will express the trait, but a female who receives one
faulty allele will not show the trait if her second X chromosome has the normal allele.
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The series of flattened sacs and associated vesicles in the cytoplasm of a cell is the ____________________
Fill in the blank(s) with correct word
The majority of fossils are found in
a. sedimentary rock. b. Antarctica. c. peat bogs. d. tar pits. e. volcanic deposits.
During the inflammatory response, dilation of blood vessels is caused by
A. both histamine and nitric oxide. B. cytokines. C. histamine. D. phagocytes. E. nitric oxide.
An organism that lacks integration centers _____
A) cannot receive stimuli B) will not have a nervous system C) will not be able to interpret stimuli D) can be expected to lack myelinated neurons