A fetus's exposure to ____ is the leading preventable cause of birth defects
a. alcohol
b. X-rays
c. viruses
d. thalidomide
e. Toxoplasma gondii
a
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What was the genotype of the mother in the P generation?
Bicoid is a maternal effect gene that is essential for the development of head structures in Drosophila. The F1 generation from a cross of two phenotypically normal flies produces normal embryos, but in the F2 cross, 25% of the embryos lack heads and die. A. BB B. Bb C. bb D. Either BB or Bb E. Either Bb or bb
A salt will dissolve in water to form ____.
A. acids B. only hydrogen and oxygen bonds C. ions other than H+ and OH- D. bases E. buffers
Rheumatoid arthritis is a type (I/II/III/IV) hypersensitivity reaction that results when B cells produce autoantibodies that damage the joints.
Fill in the blank(s) with the appropriate word(s).
What is the difference between a point mutation and a chromosomal aberration?
Both are mutation types, but in a point mutation, the mutation occurs at a specific point anywhere on the chromosome. In a chromosomal aberration, the mutation is all throughout the chromosome. Both are mutation types, but in a point mutation, one base pair is changed, and in a chromosomal aberration, an entire section of the chromosome is altered. A chromosomal aberration is caused by DNA damage, while a point mutation is a mutation of a single base. A chromosomal aberration is an all-inclusive term for any DNA mutation, and a point mutation is a type of aberration. Point mutations occur at a specific point due to sunlight, whereas chromosomal aberrations can occur anywhere due to any type of DNA damage.