What fraction of the time will the cross of Aa Bb Cc with Aa Bb Cc produce an offspring of genotype
Aa bb CC?
a. 1/64
b. 1/32
c. 3/64
d. 1/16
e. 9/64
B
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Which cellular response follows activation of a ligand-gated ion channel?
a. direct regulation of gene expression b. generation of an electrical signal
c. activation of a phosphorylation cascade d. activation of a second messenger pathway e. direct activation of a kinase
The heritable disorder fragile X syndrome, a major cause of intellectual disability, is caused by
A) production of enzymes that break the phosphate backbone. B) UV light. C) X-rays. D) the presence of an extra X chromosome in the sperm or egg. E) the expansion of a region of trinucleotide repeats.
Reproductive isolation is marked by the __________ of gene flow between populations.
Fill in the blank(s) with the appropriate word(s).
Which atomic particle has no charge and is located in the nucleus?
A. proton B. neutron C. electron D. isotope E. ion