A deletion of a particular stretch of chromosome 15 can cause either Prader-Willi syndrome or Angelman syndrome, depending on
A. the parental origin of the normal and deleted chromosome.
B. whether or not the region is methylated properly.
C. whether a translocation event has occurred.
D. whether a nondisjunction event has occurred.
A. the parental origin of the normal and deleted chromosome.
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What is a primary difference between polymerase chain reaction (PCR) and traditional cloning procedures such as those used to clone the human growth hormone gene?
A) PCR and traditional cloning make use of different types of bacteria. B) PCR and traditional cloning make use of different types of vectors. C) PCR uses plasmid vectors, whereas traditional cloning uses bacteria. D) PCR eliminates the need for restriction enzymes, vectors, and cells. E) PCR is more time-consuming, but the purity of the obtained DNA clone is much higher than in traditional cloning.
In the diagram, which of the following is true?
A. Both diagrams show developmental sequences occurring in the same animal.
B. Both diagrams show blastulae.
C. Diagram II shows gastrulation in a bird.
D. Diagram I shows gastrulation in a frog.
E. Diagram I shows gastrulation in a mammal and diagram II shows gastrulation in a reptile.
Blood plasma contains dissolved proteins and hormones
Indicate whether the statement is true or false
If a trait is polygenic, then:
a. Mendel's laws do not apply. b. it is polygenic. c. its inheritance is multifactorial. d. B and C. e. All of the above.