For a given cross, the expected number of double recombinants is 20 and the observed number of double recombinants is 15. What is the interference calculation (I)?
A) 0.25
B) 1.33
C) 20
D) 0.75
E) 15
A
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A restriction in genetic variability caused by a drastic reduction in population size is called a
A. Hardy-Weinberg effect. B. founder effect. C. polymorphic effect. D. adaptive effect. E. bottleneck effect.
B cells differentiate into plasma cells, which produce antibodies
a. True b. False
Excitatory postsynaptic potentials are generally caused by _______channels opening, while inhibitory postsynaptic potentials may be caused by _______ channels opening.
a. Na+; Cl– b. K+; Cl– c. Ca2+; K+ d. Cl–; K+
Achondroplasia is a form of dwarfism in humans. It is caused by a mutant allele of the fibroblast growth factor receptor gene (FGFR) that produces an overactive protein. Having one copy of the mutant allele results in dwarfism. Two copies of the mutant allele results in death before birth. If two people with achondroplasia have a child together, what is the probability that their child will also have achondroplasia?
A) 0 B) 1/2 C) 2/3 D) 3/4 E) 1