SCIENCE

SCIENCESCIENCEGenetics QuizGenetics Quiz

Genetics Quiz1. 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.

a. Downs Syndromeb. Turners Syndromec. Cystic Fibrosisd. Haemophilia

C

Genetics Quiz2. 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. A is always paired with G: T is always paired with C. b. A is always paired with T; G is always paired with C. c. G is always paired with T; A is always paired with C. d. There is no rule: any combination is possible.

B

Genetics Quiz3. An individual’s DNA was examined and

found to contain 23% Adenine molecules. What percentage of the DNA is made up of Guanine molecules?

a. 23%b. 46%c. 54%d. 27% D

Genetics Quiz4. Ribosomes are membrane-less

organelles in the cytoplasma. they are formed in the nucleolus b. they are made of RNAc. they are involved in protein synthesisd. a, b, and ce. a and c D

Genetics Quiz5. 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 ce. a and c

E

Genetics Quiz6. tRNA a. is a type of RNAb. it has an anti-codon on one end and

an amino acid at the otherc. there are as many tRNAs as there are

possible codon combinations (64)d. a, b, ce. b, c

Genetics QuizTrue or False7. Somatic cells include all body cells with the exception

of sperm and egg producing cells. T8. 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

Genetics Quiz10. 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 peptideT

Genetics Quiz13. 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 aboveD

Genetics Quiz14. 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

Genetics Quiz15. 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

Genetics Quiz16. 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

Genetics Quiz17. An allele is: a. another word for a geneb. a homozygous genotypec. a heterozygous genotype d. one of several possible forms of a

gene D

Genetics Quiz18. Assuming that both parent plants in the

diagram below are homozygous, why would all of the f1 generation have yellow phenotypes?  

    a. because the f1 genotypes are homozygousb. because yellow is dominant over green Bc. because both parents passed on yellow alleles

Genetics Quiz19. 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.

a. BBb. bbc. Bbd. either answer A or B C

Genetics Quiz20. What is the name for the diagram one

draws in genetics problems to determine the types of offspring produced by crossing two parents?

a. Karyotypeb. Matrixc. x vs y graphd. Punnett square D

Genetics Quiz21. Down Syndrome (trisomy 21) is a

genetic disorder in which the afflicted individual:

a. inherits one more gene than normalb. inherits one less gene than normalc. inherits one extra chromosome #21d. inherits one less chromosome #21

C

Genetics Quiz22. 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?

a. 25%b. 50%c. 75%d. 100%

B

Genetics Quiz23. Which event in meiosis involves the

exchange of genetic material between chromosomes?

a. crossing overb. DNA replicationc. Cytokinesisd. amniocentesis

A

Genetics Quiz24. Which of the following gives the correct

order of stages in mitosis?

a. metaphase, prophase, anaphase, telophaseb. telophase, anaphase, prophase, metaphasec. metaphase, prophase, anaphase, telophased. prophase, metaphase, anaphase, telophase

C

Genetics Quiz25. Human body (somatic) cells contain

____ chromosomes; and the gametes (sex cells) contain _____ chromosomes.

a. 23; 46b. 46; 23c. 46; 46 Bd. 23; 23

Genetic Quiz26. 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.

a. the son b. the man Dc. the woman d. both parents