A person is genetically XX and develops as a male. How can this be explained?
a. In humans, males are XX.
b. An error in karyotyping this individual must have occurred because XX individuals cannot develop into a male.
c. A piece of a Y chromosome has become attached to one of the X chromosomes.
d. The SRY gene was deleted in this individual.
c. A piece of a Y chromosome has become attached to one of the X chromosomes.
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The genomes of Arabidopsis thaliana, a small member of the mustard family of plants, and rice, Oryza sativa, have been sequenced. The findings include
A. the genome for each is almost identical, indicating that they diverged in the fairly recent past. B. they each have very high copy numbers (slightly divergent copies of a gene), probably indicating episodes of polyploidy and/or segmental duplication. C. repetitive DNA, including retrotransposons, was a very small proportion of both genomes. D. more than 90% of the genes in each were particular to plants and not found in animal or fungal genomes.
Which of the following polymerases functions in translesion synthesis and is considered error-prone because it lacks the 3'-5' exonuclease activity used for proofreading?
A. DNA Pol I B. DNA Pol II C. DNA Pol III D. DNA Pol IV E. None of these choices is correct.
Both parents are heterozygous for Tay-Sachs disease (an autosomal recessive disorder). Three children in a row were born with Tay-Sachs disease. What is the chance that a fourth child will have Tay-Sachs disease?
a. 25% b. 50% c. 75% d. 100%
Yersinia pestis
What will be an ideal response?