Tay Sachs disease is more common in people with a certain Jewish ethnic background because 

A. mutations are more common in people with that ethnic background.
B. the frequency of the allele for Tay Sachs is higher in people with that ethnic background.
C. they only marry within their group.
D. the population has little genetic diversity.


B. the frequency of the allele for Tay Sachs is higher in people with that ethnic background.

Biology & Microbiology

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Thick- skinned rhinoceroses and elephants were once classified together as pachyderms (meaning "thick skin"). They actually descended from different ancestors that in turn evolved from a thin-skinned common ancestor that was not included in the pachyderms. Pachyderms were therefore, as a taxon,

A. monophyletic. B. polyphyletic. C. paraphyletic. D. a supergroup. E. a kingdom.

Biology & Microbiology

Hemophilia is not seen in individuals heterozygous for the hemophilia gene. Thus, the disease is ________.

a. recessive b. codominant c. dominant d. X-linked

Biology & Microbiology

Four of the five choices listed below are related by

the quantity of chromosomes present. Select the exception. a. spores b. sporophyte c. egg d. sperm e. gametophyte

Biology & Microbiology

Semen does not contain

a) prostate fluid b) urine c) fructose d) prostaglandins e) both b and d are correct

Biology & Microbiology