Assume that a mutation occurs in the gene responsible for the production of hexosaminidase A, such that only about 50 percent of the enzyme activity is found in the heterozygote compared with a homozygous normal individual
If heterozygotes are phenotypically normal, we would say that the mutant allele is recessive to its normal allele.
Indicate whether the statement is true or false
TRUE
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What is one reason why many mutations may be deleterious? (This question ties in information from other chapters.)
A. Because the genetic code has redundancy built in. B. Because if a mutation changes the primary structure of a protein, the protein may no longer work. C. Because the body has no way to detect or correct mutations. D. Most mutations are actually beneficial, not deleterious. E. Any change in the DNA sequence means that DNA no longer functions properly.
When a gamete that is lacking a sex chromosome due to nondisjunction has fused with a gamete carrying an X chromosome, this type of abnormality leads to the _________ .
A. Triple X syndrome B. Down Syndrome C. Edward Syndrome D. the Turner syndrome E. Klinefelter Syndrome
The equation AB + H2O ? A + B would be catalyzed by which of the following classes of enzymes?
A) oxidoreductases B) transferases C) hydrolases D) ligases E) isomerases
Scientists are attempting to genetically modify rice so that it will not incorporate ____ into the grains
a. arsenic b. methylmercury c. chelated iron d. lead e. uranium hexafluoride