If a daughter expresses an X-linked recessive gene, she inherited the trait from
a. her mother.
b. her father.
c. both parents.
d. neither parent.
e. her grandmother.
C
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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. Based in this information, what can you infer about the inheritance of the FGFR alleles?
A) The mutant FGFR allele is pleiotropic. B) Some achondroplastic dwarfs are heterozygous for the mutant allele and some are homozygous. C) The wild-type and mutant FGFR alleles are codominant. D) The mutant FGFR allele shows incomplete penetrance.
In a population of rabbits, those able to outrun predators will survive to reproduce, eventually leading to a population
of faster rabbits. This is an example of ____ selection.
a. directional b. stabilizing c. disruptive d. mutational e. restricted
Atoms of isotopes
a. are electrically unbalanced. b. behave the same chemically and physically but differ biologically from other isotopes. c. are the same physically and biologically but differ from other isotopes chemically. d. have the same number of protons but a different number of neutrons. e. are produced when atoms lose electrons.
The responsiveness of cells to calcitonin increases as an individual ages; maximum responsiveness occurs in elderly individuals as a mechanism to improve the stability and strength of bones
Indicate whether the statement is true or false