Question Set 6 Ch. 9-12

  1. In Mendel's time, most people believed that

    2. (A) all genetic traits bred true.
    (B) only certain forms of domesticated plants and animals bred true.
    (C) the characteristics of parents were blended in the offspring.
    (D) acquired characteristics were inherited.
    Answer

  2. In Mendel's experiments with pea plants, which part of the flower did he remove to prevent self-fertilization?

    3. (A) petals
    (B) pistils
    (C) stamens
    (D) stigmas
    Answer

  3. If R is dominant to r, then the offspring of the cross of RR with rr will

    4. (A) display the same phenotype as the RR parent.
    (B) display the same phenotype as the rr parent.
    (C) have the same genotype as the RR parent.
    (D) have the same genotype as the rr parent.
    Answer

  4. For monohybrid experiments, a testcross could result in which of the following ratios?

    5. (A) l:l
    (B) 2:1
    (C) 9:3:3:l
    (D) 1:2:1
    Answer

  5. How many different kinds of gametes will be expected from an individual that is AaBbCC?

    6. (A) 2
    (B) 3
    (C) 4
    (D) 8
    Answer

  6. The principle of independent assortment

    7. (A) cannot be demonstrated in a monohybrid cross.
    (B) is illustrated by the behavior of linked genes.
    (C) indicates that the expression of one gene is independent of the action of another gene.
    (D) states that alleles for the same characteristic separate during meiosis.
    Answer

  7. Genes at one locus that affect the expression of genes at a different locus are said to be

    8. (A) linked
    (B) codominant
    (C) penetrant
    (D) epistatic
    Answer

  8. Chromosomes that are not involved in sex determination are termed

    9. (A) alleles
    (B) nucleosomes
    (C) autosomes
    (D) liposomes
    Answer

  9. Colorblindness in humans is determined by an X-linked recessive gene. If a color-blind man and a woman with normal vision whose father was color blind have a son, what is the probability that the son will be colorblind?

    10. (A) 25%
    (B) 50%
    (C) 75%
    (D) 100%
    Answer

  10. If two genes are on the same chromosome,

    11. (A) crossing over occurs frequently
    (B) they assort independently
    (C) they are in the same linkage group
    (D) they segregate during meiosis.
    Answer

  11. Non-disjunction involving the X-chromosome may occur during oogenesis and produce two kinds of eggs. If normal sperm fertilize these two types, which of the following pairs of genotypes are possible?

    12. (A) XX and XY
    (B) XXY and XO
    (C) XYY and XO
    (D) XYY and YO
    Answer

  12. A new plant arises in your garden. The chromosome complement is determined to be 4n, a tetraploid. (All of its relatives are diploid.) What would you expect its reproductive ability (fertility) to probably be?

    13. (A) normal
    (B) abnormal
    (C) sterile
    (D) impossible to say
    Answer

  13. Histone-DNA units are called

    14. (A) polysomes
    (B) ribosomes
    (C) nucleosomes
    (D) chromosomes
    Answer

  14. In DNA, complementary base pairing occurs between

    15. (A) cytosine and uracil
    (B) adenine and guanine
    (C) adenine and uracil
    (D) adenine and thymine
    Answer

  15. Which statement is not true about Fred Griffith's experiment?

    16. (A) mice injected with S bacteria die.
    (B) mice injected with heat-killed S bacteria die.
    (C) mice injected with heat-killed S bacteria and live R bacteria die.
    (D) mice injected with R bacteria live.
    Answer

  16. The genetic code is made up of units consisting of how many nucleotides?

    17. (A) 2
    (B) 3
    (C) 6
    (D) 20
    Answer

  17. Transcription

    18. (A) occurs on the surface of the ribosome.
    (B) is the final process in the assembly of proteins.
    (C) occurs during the synthesis of any type of RNA from a DNA template.
    (D) is catalyzed by DNA polymerase.
    Answer

  18. If the DNA triplets were ATG-CGT, the mRNA codons would be

    19. (A) AUGCGU
    (B) ATGCGT
    (C) UACGCA
    (D) UAGCGU
    Answer

  19. A regulator genes produces which of the following?

    20. (A) repressor protein
    (B) regulatory enzyme
    (C) promoter
    (D) operator
    Answer

  20. If you consider all of the genes in a cell, how many will be turned on during its lifetime?

    21. (A) all
    (B) more than 50%
    (C) less than 50% but a lot
    (D) very few
    Answer