Assume that investigators crossed a strain of flies carrying the dominant eye mutation Lobe on the second chromosome with a strain homozygous for the second chromosome recessive mutations smooth abdomen and straw body. The F1 Lobe females were then
backcrossed with homozygous smooth abdomen, straw body males, and the following phenotypes were observed:
smooth abdomen, straw body 820
Lobe 780
smooth abdomen, Lobe 42
straw body 58
smooth abdomen 148
Lobe, straw body 152
Give the map units between Lobe and straw.
A) 10 B) 15 C) 7.5 D) 20 E) 5
Answer: B
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Which of the following is not a process in the scientific method?
A. Belief in a preconceived idea B. Laboratory experimentation C. Formulation of a hypothesis D. Development of a theory E. Systematic observation
Which hormone establishes and maintains normal metabolism?
a. epinephrine b. aldosterone c. oxytocin d. PTH
e. thyroid hormoneStress increases cortisol secretion. Why would diabetics have problems controlling their blood sugar levels when they are stressed?
What will be an ideal response?
An adult stem cell differs from an embryonic stem cell in that it is not
A. totipotent. B. capable of further cell divisions. C. able to accept methyl groups. D. able to produce a blastocyst.