What is the difference between an autosomal dominant and autosomal recessive pattern of inheritance?
What will be an ideal response?
Ans: One copy of a mutated gene necessary for autosomal dominant and 2 genes for autosomal recessive.Autosomal dominant disorder is when a mutated copy of the gene in each cell is sufficient for a person to be affected by an autosomal dominant disorder. Each person usually has one affected parent. Autosomal dominant disorders tend to occur in each generation of the affected family. Autosomal recession occurs when two mutated copies of the gene are present in each cell when a person has an autosomal recessive disorder. An affected person usually has uninfluenced parents who each carry a single copy of the mutated gene (and are referred to as carriers).Unlike an autosomal dominant trait, the characteristics of a recessive trait can only be expressed if both alleles are recessive. Unlike an autosomal recessive trait, an autosomal dominant trait does not depend on the presence of two dominant alleles
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A common organism of the temperate infralittoral fringe (lower intertidal) is called:
a. Laminaria. b. Entermorpha. c. Ulva. d. lichen. e. giant kelp.
The enzyme lysozyme offers protection from
a. viruses. b. bacteria. c. fungi. d. protists. e. viruses and bacteria.
For a skeletal muscle to contract, all of the following must occur EXCEPT ______.
a. calcium levels must increase in close proximity to contractile proteins. b. a drop in calcium levels also stimulates contraction. c. once the stimulation by a nerve ceases, skeletal muscle can no longer contract. d. a nerve impulse is required to initiate contraction. e. All of these are correct.
A famous example of allometry, the antlers of the extinct Irish elk ( Megaceros giganteus)
A. were expressed at a different position from those of any other deer. B. were smaller, relative to body mass, than those of any other deer. C. were larger, relative to body mass, than those of any other deer. D. grew at the same rate as the deer's body mass. E. were expressed at a different time during ontogeny from those of any other deer.