The gray crescent is
a. formed where the sperm penetrates the egg.
b. formed opposite from where the sperm enters the
egg.
c. the portion of the egg where the yolk is found.
d. located next to the vegetal pole of the egg.
e. the point where the first cleavage occurs.
Answer: b
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In Drosophila melanogaster the allele for long wings is dominant over the allele for vestigial wings,
and the allele for a gray body is dominant over the allele for a black body. A testcross was done to check for genetic linkage between the genes for these traits, with the following results for the offspring:410 flies with long wings and a black body 105 flies with long wings and a gray body 390 flies with vestigial wings and a gray body 95 flies with vestigial wings and a black body Which of the choices below best represents the map distance between the genes for these two traits?
a. 20.0 map units b. 40.0 map units c. 10.0 map units d. 100.0 map units e. 9.5 map units
Dietary treatment of galactosemia ____
a. need not begin until one or two months after birth b. consists of very low protein intake c. can usually be discontinued by the age of twelve d. completely eliminates symptoms of the disease e. should be started within a few days after birth
The full range of electromagnetic energy is called the ________ spectrum
A) visible B) electromagnetic C) energy D) ultraviolet
Nonspecific chemical defenses of the human host include all of the following EXCEPT ______.
A. lactic acid B. lysozyme C. antibodies D. hydrochloric acid