Short tandem repeat sequences (STRs) can be used for DNA fingerprinting because ____.
A. they are expressed at different levels in individuals.
B. they can be amplified by PCR.
C. the number of repeats varies between individuals.
D. they are found in different locations in individuals.
E. their DNA sequence varies between individuals.
C. the number of repeats varies between individuals.
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Osmoregulation is the control of
a. the internal environment. b. temperature. c. metabolic wastes. d. water and ion balance. e. hyperthermia.
The process by which DNA is reproduced, with the use of associated enzymes, is
A. DNA translation. B. catalyzed protein synthesis. C. DNA transcription. D. DNA replication. E. DNA ligation.
Statistics indicate that _______ percent of children with sickle-cell disease live to adulthood.
A. 25 B. 50 C. 75 D. 15
Cystic fibrosis results from mutations in a single gene that lies on Chromosome 7. Only homozygous mutant (ff) individuals are sick; homozygous wild-type (FF) and heterozygous (Ff) individuals are healthy
A healthy married couple has one child with cystic fibrosis and the wife is pregnant with a second child. A. What is the genotype of the mother? The father? B. What is the chance that the second child will have cystic fibrosis?