Describe how an epigenetic trait differs from a mutated trait
What will be an ideal response?
An epigenetic trait is a stable phenotype that results from changes in gene expression involving chemical modification of DNA bases or the histone proteins associated with them. Unlike mutations, which involve a change in the DNA sequence, epigenetic modifications do not change the nucleotide sequence, but they do affect how genes behave.
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DNA polymerases from Escherichia coli cannot be used to artificially copy gene sequences with a thermocycler
Indicate whether the statement is true or false.
Which is the first antibody secreted during immune responses and the first one produced by newborns?
a. IgA b. IgD c. IgE d. IgG e. IgM
Which type of molecule is most likely to defuse across the plasma membrane?
a. small and lipid soluble b. small and water soluble c. large and lipid soluble d. large and water soluble
Autosomal nondisjunction can result in
A) trisomy X. B) Down syndrome. C) Klinefelter syndrome. D) Turner syndrome. E) XYY males.