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SCIENCE

SCIENCE. Genetics Quiz. Genetics Quiz. 1. The genetic condition that is characterized by: thickened, viscous secretions of the mucosal linings of the lungs, intestine and pancreas which cause obstruction and blockage of these organs. Accompanied by large salt loss. Downs Syndrome

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SCIENCE

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  1. SCIENCE Genetics Quiz

  2. Genetics Quiz 1. The genetic condition that is characterized by: thickened, viscous secretions of the mucosal linings of the lungs, intestine and pancreas which cause obstruction and blockage of these organs. Accompanied by large salt loss. • Downs Syndrome • Turners Syndrome • Cystic Fibrosis • Haemophilia C

  3. Genetics Quiz 2. DNA is composed of building blocks called nucleotides: deoxyribose sugar, a phosphate group and one of four nitrogen bases: adenine (A), thymine (T), guanine (G), and cytosine (C). Which rule about nucleotide pairing is true? • A is always paired with G: T is always paired with C. • A is always paired with T; G is always paired with C. • G is always paired with T; A is always paired with C. • There is no rule: any combination is possible. B

  4. Genetics Quiz 3. An individual’s DNA was examined and found to contain 23% Adenine molecules. What percentage of the DNA is made up of Guanine molecules? • 23% • 46% • 54% • 27% D

  5. Genetics Quiz 4. Ribosomes are membrane-less organelles in the cytoplasm • they are formed in the nucleolus • they are made of RNA • they are involved in protein synthesis • a, b, and c • a and c D

  6. Genetics Quiz 5. DNA replication during interphase a. involves untwining of the two strands and addition of nucleotides b. involves untwining sections of the DNA and simultaneous replication of each strand using various enzymes c. each strand serves as a template for a new DNA molecule d. b and c e. a and c E

  7. Genetics Quiz 6. tRNA • is a type of RNA • it has an anti-codon on one end and an amino acid at the other • there are as many tRNAs as there are possible codon combinations (64) • a, b, c • b, c

  8. Genetics Quiz True or False 7. Somatic cells include all body cells with the exception of sperm and egg producing cells. T 8. Gametes (sperm or egg) are diploid, that is they have half the number of chromosomes of either parent F (haploid means half, not diploid) 9. the diversity of human variation is because the chromosomes of each of our parents crosses its DNA with its homologous pair. One set of these crossed over chromosomes is packaged into each haploid daughter cell (sperm/egg). T

  9. Genetics Quiz 10. Uracil is a pyrimidine found in RNA instead of Cytosine F (uracil replaces thymine in mRNA) 11. Alleles are the genetic code for a character (example hair color), found on both strands of the DNA and on specific locations on the homologous chromosomes T 12. The genetic code on DNA is first translated into mRNA and then transcribed into a poly peptide T

  10. Genetics Quiz 13. Phenotype is:  a. the genetic make-up of an individualb. the same for parent and offspringc. not observabled. the appearance of an individual e. none of the above D

  11. Genetics Quiz 14. In humans, brown eyes (B) is dominant to blue eyes (b). A brown eyed man marries a blue eyed woman. The possible eye colors of their children are: a. all brownb. all bluec. half brownd. 3/4 brown, 1/4 bluee. not enough information is given E

  12. Genetics Quiz 15. If an individual has a recessive phenotype for a given trait, the genotype must be: a. heterozygousb. homozygous recessive c. homozygous dominantd. either homozygous recessive of heterozygous e. determined by performing a test cross B

  13. Genetics Quiz 16. If an organism with the genotype Ww is crossed with a Ww organism, what would be the proportion of offspring that would be heterozygous? a. 1/4b. 1/2c. 3/4d. all would be heterozygouse. none of the offspring B

  14. Genetics Quiz 17. An allele is: • another word for a gene • a homozygous genotype • a heterozygous genotype • one of several possible forms of a gene D

  15. Genetics Quiz 18. Assuming that both parent plants in the diagram below are homozygous, why would all of the f1 generation have yellow phenotypes?   • because the f1 genotypes are homozygous • because yellow is dominant over green B • because both parents passed on yellow alleles

  16. Genetics Quiz 19. If fur colour in mice is caused by the following: B = black and b = brown, choose the genotype for the organism which will have brown fur. • BB • bb • Bb • either answer A or B C

  17. Genetics Quiz 20. What is the name for the diagram one draws in genetics problems to determine the types of offspring produced by crossing two parents? • Karyotype • Matrix • x vs y graph • Punnett square D

  18. Genetics Quiz 21. Down Syndrome (trisomy 21) is a genetic disorder in which the afflicted individual: • inherits one more gene than normal • inherits one less gene than normal • inherits one extra chromosome #21 • inherits one less chromosome #21 C

  19. Genetics Quiz 22. Assume that in mice, B = black fur, b = brown fur. If a heterozygous black mouse mates with a homozygous brown mouse, what percent of their offspring will have black fur? • 25% • 50% • 75% • 100% B

  20. Genetics Quiz 23. Which event in meiosis involves the exchange of genetic material between chromosomes? • crossing over • DNA replication • Cytokinesis • amniocentesis A

  21. Genetics Quiz 24. Which of the following gives the correct order of stages in mitosis? • metaphase, prophase, anaphase, telophase • telophase, anaphase, prophase, metaphase • metaphase, prophase, anaphase, telophase • prophase, metaphase, anaphase, telophase C

  22. Genetics Quiz 25. Human body (somatic) cells contain ____ chromosomes; and the gametes (sex cells) contain _____ chromosomes. • 23; 46 • 46; 23 • 46; 46 B • 23; 23

  23. Genetic Quiz 26. A man and a woman, both with normal thumbs, have a son with hitchhiker's thumb, (autosomal recessive trait). It is likely that ___________ is (are) heterozygous. • the son • the man D • the woman • both parents

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