Quiz 8 Flashcards
1.If a homozygote for the recessive gene for phenylketonuria has a large number of children with a genetically normal individual, what can be said about these children?
Select one:
a. one quarter of the children will be phenylketonuric
b. all the children will have a normal genotype
c. all the boys will have phenylketonuria
d. all the children will be carriers of phenylketonuria
e. one quarter of the children will have brain damage
d. all the children will be carriers of phenylketonuria
2.Kleinfelters syndrome males have a genotype XXY. This is most likely to be caused by:
Select one:
a. non-specific replication of the X chromosome
b. the age of the father
c. inbreeding between close relatives
d. non-disjunction during meiosis in the mother
e. a point mutation during meiosis
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d. The correct answer is: non-disjunction during meiosis in the mother
3. Non disjunction of sex chromosomes in just the mother could NOT lead to a child with the genotype: Select one: a. all these genotypes are possible b. XXX c. XY d. XXY e. XO
c. XY
4.Two parents, both with the phenotype of Widows peak (dominant), have a child with a straight hairline. What is the chance that their next child will also have a straight hairline?
Select one:
a. one in sixteen
b. one in two
c. one in four
d. all their children will have straight hairlines
e. there is no chance
c. one in four
5.The location of a of a gene on a chromosome is called a(n) Select one: a. allele b. point c. chromatid d. locus e. start codon
d. locus
6. Two forms of the same gene with different nucleotide sequences are called: Select one: a. loci b. nonsense codons c. alleles d. chromatids e. point mutations
c. alleles
- Inborn errors of metabolism occur when:
Select one:
a. the mother is exposed to toxins during pregnancy
b. individuals are homozygotes
c. the diet of an individual does not contain essential nutrients
d. populations have small numbers of founders
e. individuals possess two defective copies of a gene for an enzyme
e. individuals possess two defective copies of a gene for an enzyme
8.Two genetically different individuals of a single species will always have differences in Select one: a. the length of their chromosomes b. their height c. the number of genes they carry d. their mitochondrial DNA e. nucleotide sequence
e. nucleotide sequence
9. The failure of chromosomes to separate normally during cell division is called: Select one: a. a sex chromosome abnormality b. non disjunction c. chromosomal mutation d. trisomy e. an inborn error of metabolism
b. non disjunction
- The family Robinson is lost in space and need to populate their newly discovered planet. Unfortunately, the only fertile members of the landing party are Will and Judy, who are brother and sister. They are both heterozygous for the recessive allele for alkaptonuria. What can be said about their children?
Select one:
a. all their children will have inborn errors of metabolism
b. one quarter of their children will be unable to metabolize phenylalanine
c. they will not be able to have any children
d. one quarter of their children will be unable to metabolize homogentisic acid
e. half of their children will be alkaptonuric
d. one quarter of their children will be unable to metabolize homogentisic aci
11. Which of these is a characteristic of cancer cells? Select one: a. they undergo apoptosis b. they exhibit contact inhibition c. they have short telomeres d. they are highly differentiated e. they can metastasize
e. they can metastasize
- Jacobs syndrome males have a genotype XYY. This condition is most likely to be caused by:
Select one:
a. inbreeding between close relatives
b. non-disjunction during meiosis in the father
c. the age of the mother
d. point mutation during meiosis
e. having a father with Kleinfelters syndrome
b. non-disjunction during meiosis in the father
13.The function of M and S cyclin/kinase complexes is to:
Select one:
a. move organelles around the cell
b. fix carbon dioxide in the Krebs cycle
c. break down cyclokinins in the liver
d. ensure equal numbers of chromosomes go into each daughter cell
e. control cell division
e. control cell division
14. Amino acid is to protein as Select one: a. fatty acid is to cell membrane b. sucrose is to cellulose c. nucleotide is to nucleic acid d. ATP is to glucose e. ribose is to RNA
c. nucleotide is to nucleic acid
15. Factors that predispose an individual to the development of cancer include: Select one: a. exposure to toxins b. all the factors given here c. radiation exposure d. heredity e. infection with certain viruses Feedback The correct answer is: all the factors given here
b. all the factors given here
