Suppose an individual is heterozygous for alternate alleles of gene A (Aa). Under what conditions would a crossover in a somatic cell of this individual lead to a clone of cells that are homozygous for a? (Pick the most precise answer.)
A) The crossover would have to occur between the A locus and the centromere and involve two homologous (nonsister) chromatids.
B) The crossover would have to occur between the A locus and the end of the chromosome and involve two homologous (nonsister) chromatids.
C) The crossover would have to occur between the A locus and the end of the chromosome and involve two nonhomologous chromosomes.
D) The crossover would have to occur between the A locus and the centromere and involve two sister chromatids.
A) The crossover would have to occur between the A locus and the centromere and involve two homologous (nonsister) chromatids.
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You have heard of a research laboratory that is investigating using therapeutic cloning techniques to treat Parkinson disease (a disease caused by the destruction of dopamine-producing cells in the brain)
What is therapeutic cloning and how could it be used to treat Parkinson disease? What are the potential benefits of therapeutic cloning compared to other techniques? What are the ethical considerations associated with therapeutic cloning? What will be an ideal response?
A newly-discovered double-stranded RNA virus which infects animal cells is found to contain a unique enzyme which synthesizes double-stranded RNA using an RNA template. Which of the following statements is likely to be true?
A) This enzyme is coded for by a gene in the host cell. B) The enzyme probably came from the host animal cell. C) The enzyme probably came from the host animal cell and is coded for by a gene in the host cell. D) The virus must bring this enzyme into the host cell as synthesizing RNA from an RNA template does not happen in animal cells. E) This enzyme would not be a good antiviral drug target as the host cell likely has a similar enzyme which could be affected by such a drug.
The term "semiconservative replication" refers to the DNA repair process known as "error-prone repair".
Answer the following statement true (T) or false (F)
Which of the following is true about the “synthetic” bacterium made in 2010?
a. A chromosome was synthesized from a known sequence and transformed into a cell from a different species. b. A chromosome was assembled from biobricks and transformed into a different species. c. Biobricks were assembled into a completely synthetic organism. d. A chromosome was synthesized from a known sequence and was transformed into an artificially created cell.