Which of the following statements about autosomal dominant inheritance is false?
a. Achondroplasia is an example of an autosomal dominant trait
b. In a testcross, a heterozygote will produce affected offspring 50% of the time.
c. Lethal dominant alleles arise through mutation but are gradually weeded out of the population.
d. Both homozygous dominant and heterozygous individuals express an autosomal dominant trait.
c
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A cell that can divide to give rise to any cell type, including those of membranes that support the developing embryo, is
A) multipotent. B) a progenitor cell. C) a differentiated cell. D) totipotent.
You are studying a novel protein. To learn more about it, you performed a screen in yeast to identify proteins that could interact with it. From the screen you got a clone for a second gene. You had the clone sequenced, and you translated the gene sequence on your computer. What is the next logical step to learn more about the function of these two proteins?
A. Localize the gene to a specific chromosomal region. B. Run a BLAST search. C. Search the human genome sequence for your clone. D. Identify the intron/exon organization.
The bulk of the energy required by the eukaryotic cell is generated by the mitochondria. The mitochondrion consists of cristae that
A) form a smooth, continuous outer membrane surrounding the entire organelle. B) form a complex fluid called a matrix outside the organelle. C) are elaborate folds on the inner membrane which hold the enzymes and electron carriers of aerobic respiration. D) are circular strands of DNA involved in producing the enzymes needed for anaerobic respiration.
Olfactory dysfunction, or dysosmia, is a problem with the sense of smell. Technically, it is a deviation from the normal sensing and perception of odor molecules, or olfactory stimuli processing
There are several different forms of dysosmia, including anosmia (stimuli do not activate the olfactory bulb), parosmia (some odors are interpreted as other odors), and phantosmia (hallucinations of smells that are not there). Based on this information, what specific condition is indicated in a person who mistakenly perceives the smell of peppermint as the same as the smell of something that is rotten, foul, and decomposed? A) Parosmia B) Anosmia C) Phantosmia D) Dysosmia