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.
A) The mutant FGFR allele is pleiotropic.
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The initial reaction of the Krebs cycle involves the addition of a
What will be an ideal response?
Some of the "dead stuff in our food" makes it into our food chain through the activity of decomposers such as fungi. Fungi are
a. photoautotrophs b. photoheterotrophs c. chemoautotrophs d. chemoheterotrophs
The trait of ________ is known to be controlled through polygenic inheritance.
Fill in the blank(s) with the appropriate word(s).