eoct practice domain iii: genetics
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EOCT practice Domain III: Genetics. 1. What is the diploid chromosome number in a human body cell?. 23 32 44 46. 2. The gene for red/green colorblindness in humans is recessive and primarily affects males. It must be located on. the X chromosome the Y chromosome - PowerPoint PPT PresentationTRANSCRIPT
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EOCT practice Domain III: Genetics
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1. What is the diploid chromosome number in a human
body cell?
A. 23B. 32C. 44D. 46
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2. The gene for red/green colorblindness in humans is recessive and primarily affects males. It must be
located onA. the X chromosomeB. the Y chromosomeC. both the X and Y chromosomesD. either the X or Y chromosome
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3. Which of the following shows how information is transformed
to make a protein?
A. DNA → RNA → proteinB. gene → chromosome → proteinC. cell respiration → ATP → proteinD. ATP → amino acid → protein
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4. The genetic disorder trisomy 21 (Down syndrome) is caused
by what genetic event?
A. crossing-overB. nondisjunctionC. base pair substitutionD. frame-shift location
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5. Pea plants have seeds that are either round or wrinkled. In this cross RR x Rr, what will be the phenotypic ratio of the
offspring?A. 50% RR and 50%
RrB. 25% RR, 50% Rr,
and 25% rrC. 50% round seeds
and 50% wrinkled seeds
D. 100% round seeds
R = Round Seedsr = Wrinkled Seeds
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Answers 1-5
A. DB. AC. AD. BE. D
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6. The process by which the order of bases in messenger RNA (mRNA)
codes for the order of amino acids in a protein is called
A. translationB. transcriptionC. replicationD. nondisjunction
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7. A gene that is sex-linked is BEST described as which of the
following?
A. It results in all male offspring.B. It results in all female offspring.C. It is located on the X chromosome.D. It is located inside the mitochondria.
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8. Which of the following correctly shows the shape of
a DNA molecule?
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9. The observed trait that appears in an organism as a result of its genetic
makeup is called the organism’sA. alleleB. genotypeC. phenotypeD. karyotype
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10. Why is it important for the cells of multicellular organisms
to undergo mitosis?
A. Mitosis allows for reproduction with male and female gametes.
B. Mitosis increases variation within an organism.
C. Mitosis produces cells that are different from the original dividing cell.
D. Mitosis produces identical cells to the original dividing cell.
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Answers 6-10
A. AB. CC. DD. CE. D
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11. Which of the following correctly lists the phases of the cell cycle
starting with interphase?
A. 4, 1, 2, 3, 6, 5B. 4, 6, 1, 5, 2, 3C. 4, 1, 6, 3, 5, 2D. 4, 1, 5, 6, 3, 2
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12. How many chromosomes are contained in a human male
gamete cell?
A. 11B. 23C. 34D. 46
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13. The genetic code in DNA is represented by unique codons that
represent a specific amino acid. Which of the following represents a codon?
A. GB. TAC. GCGCD. CAT
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14. The cell shown below is undergoing mitosis. The daughter chromosomes are moving toward opposite poles of the cell.
Which phase of mitosis is shown to the right?A. anaphaseB. metaphaseC. prophaseD. telophase
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15. Two organisms, each with genotype AaBb, are crossed. The
expected phenotypic ratio in the F1 generation is expected to be
A. 4:4:4:4B. 7:6:2:1C. 8:4:2:2D. 9:3:3:1
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Answers 11-15
A. CB. BC. DD. AE. D
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16. In rabbits, albinism (b) is recessive to normal brown coloration (B). When an albino female was
crossed with a brown male, they produced 4 brown offspring and 1 albino. What was the genotype of the
male parent?
A. bb onlyB. Bb onlyC. BB onlyD. BB or Bb
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17. In protein synthesis, translation is the process that
directly results in the
A. production of amino acid chainsB. manufacture of mRNAC. copying of one DNA molecule into two
moleculesD. movement of protein from one cell to
another
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18. Information on mRNA is used to make a sequence of amino
acids into a protein by which of the following processes?
A. replicationB. translationC. TranscriptionD. transference
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19. What is a source of genetic variation?
A. mutationB. adaptationC. replicationD. transcription
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20. ATG is a DNA triplet that codes for an amino acid. Which mRNA
codon will pair with the ATG triplet?
A. ATGB. GTUC. TACD. UAC
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Answers 16-20
A. BB. AC. BD. AE. D
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21. Which of the following is the correct base-pairing rule for DNA?
A. A-U; C-GB. A-G; T-CC. A-T; G-C
D. A-C; T-G
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22. A mutagenic factor that can alter DNA by the loss of a chromosome
segment is known as
A. translocationB. crossing overC. deletionD. nondisjunction
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23. In Mendel’s experiments with a single trait, the trait that disappeared in the first
generation and reappeared in the next generation is called the
A. homozygous traitB. dominant traitC. recessive traitD. heterozygous trait
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24. Changes to an organism’s DNA can cause unexpected traits to be expressed in its offspring. DNA in an individual’s gametes will most likely be
altered before being passed to offspring if exposed to
A. x-raysB. loud soundsC. magnetic fieldsD. extreme temperatures
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25. Agricultural companies have developed the ability to control the genetic characteristics of their crops. Genetic engineering techniques have been
used to produce all of the following effects EXCEPT
A. grow salt-tolerant crop plantsB. decrease harvesting timeC. make crop plants resistant to diseaseD. decrease soil nitrogen levels
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Answers 21-25
A. CB. CC. CD. AE. D
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26. In fruit flies, the gray body color (G) is dominant to the ebony body color (g). What is the genotypic ratio of the offspring of a cross between a heterozygous gray female and an
ebony male?
A. 25% Gg, 75% ggB. 50% Gg, 50% ggC. 75% gray, 25% ebonyD. 100% gray
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27. The process of meiosis produces gametes. How does this process increase reproductive variability?
A. Different combinations of alleles are produced.B. Each allele from the parent cell forms a separate
gamete.C. Each pair of genes undergoes crossing-over with
different genes.D. The two genes are passed on to a daughter cell,
resulting in new traits.
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28. DNA and RNA are nucleic acids. A characteristic of RNA is
that it
A. remains in the chromosomes in the nucleusB. is involved in translating information in DNA
into proteinsC. undergoes crossing-over during meiosisD. is replicated during the process of mitosis
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Answers 26-28
A. BB. AC. B