P, D, and Q are three genes found on a single chromosome in greyhounds. The recombination frequencies between the three genes are shown below. In which order are these genes found on the greyhound chromosome?P-D = 50%
P-Q = 20%
D-Q = 30%
A. P-Q-D
B. Q-D-P
C. D-P-Q
D. P-D-Q
E. It is impossible to determine.
Answer: A
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Why do some single-celled eukaryotes occur primarily as haploid cells, whereas others occur primarily as diploid cells?
A. Only the eukaryotes that reproduce sexually will occur as diploid cells. B. Only the eukaryotes that reproduce sexually will occur as haploid cells. C. Only the eukaryotes that reproduce asexually will occur as diploid cells. D. Only the eukaryotes that reproduce asexually will occur as haploid cells. E. None of the answers options is correct.
Which of the following choices is not a characteristic of cancer cells?
a. altered plasma membrane and cytoplasm b. increased capacity for adhesion c. mutated DNA d. abnormal growth and division
The deuterostomes are animals whose
a. stomach is in front of the crop. b. mouth is covered by a fleshy lip. c. blastopore becomes the anus. d. digestive tract is lined by mesoderm.
Generally, the senses of the skin are somewhat specialized with
Select one: a. Pacinian corpuscles, Ruffini's endings, and Krause's end bulbs detecting pain. b. Meissner's corpuscles and Merkel's disks detecting fine touch. c. one type of nerve cell detecting both hot and cold. d. all types spread uniformly in the dermal tissue throughout the body. e. temperature receptors, free nerve endings in the dermis.