Please help me with this biology test! Please no fake answers,i really need help with this. 10pts who help me!
3. A type of chromosome change that involves reversing a fragment of the original chromosome is
A. a duplication.
B. a deletion.
C. an inversion.
D.a translocation.
4. Down syndrome is also known as Trisomy 21 because people have
A. two copies of chromosome 21.
B.one copy of chromosome 21.
C.four copies of chromosome 21.
D. three copies of chromosome 21.
5. During which phase is nondisjunction likely to occur?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
7. Identifying genes will aid in
A. diagnosing common ailments.
B. treating common ailments.
C. preventing common ailments.
D. all of the above.
8. Lethan dominant alleles are less common than lethan recessive alleles because
A. lethan recessive alleles usually have a large effect on carriers.
B. most people with dominant disorders die before producing offspring.
C. lethan dominant alleles cannot be caused by a natural mutation.
D. none of the above.
Small proteins that the DNA are wrapped around are called...
A. enzymes.
B. histones.
C. DNA polymerase.
D. helicase.
The event in which homologous chromosomes or sister chromatids fail to separate during meiosis is called
A. nondisjunction.
B. duplication.
C. deletion.
D. translocation.
. The sex-linked allele for colorblindness is located on
A. chromosome 21.
B. the X chromosome only.
C. the Y chromosome only.
D. both the X chromosome and the Y chromosome
What type of effect would you expect large deletions to have on the body?
A. Little to no effect.
B. Some effect.
C. Serious effect.
13. Which of the following is caused by a dominant allele?
A. Huntington's disease
B. albinism
C. cystic fibrosis
D.none of the above
14. Which of the following statements is NOT true?
A.A person with Huntington's disease might not pass the allele for the disease to his or her offspring.
B. A person with Huntington's disease might be homozyous for the disease.
C. Huntington's disease is caused by a recessive allele.
D. A person who inherits one allele for Huntington's disease will develop the disease.
15. Which of the following would you be least likely to see in a pedigree?
A. All of the symbols are unshaded.
B. All of the symbols are shaded.
C. All of the symbols are half-shaded.
D. About half of the symbols are circles.
16. A pedigree showing the inheritance of Huntington's disease within a family WOULD NOT show any half-shaded symbols.
A. True
B. False
17. In a pedigree for a recessive trait, if a mother is represented by a shaded circle and a father is represented by a shaded square, their children cannot be represented by HALF-SHADED circles or squares.
A. True
B. False
18. Two parents who have Huntington's disease MAY produce an offspring who does not have Huntington's disease.
A. True
B. False
19. Cancer occurs from a single mutation.
A. True
B. False
20. Tumor-suppressor genes make proteins called growth factors.
A. True
B. False
21. Growth factors are proteins that initiate cell division.
A. True
B. False
22. Cancer can be inherited.
A. True
B. False
23. Cancer is a genetic disease.
A. True
B. False
24. If an individual inherits a mutated tumor-suppressor gene (i.e. BRCA1) they will DEFINITELY develop cancer.
A. True
B. False
25. If a person develops skin cancer they do NOT have to worry about passing it to their offspring because the mutations are in the skin cells not in the gametes.
A. True
B. False 3) C. inversion
4) D. three copies
5) D. Telophase.. i think. nondisjunction is failure to separate during meiosis I or II, telophase is the last part of cell division
7) A. diagnosing, you can't necessarily treat something based off the gene
8) D. i don't believe there is a reason for that one.
9) A. almost all enzymes are proteins, C and D are both proteins, B has nothing to do with it.
10) A. nondisjunction
11) B. X chromosome
12)C. large deletions can alter the whole order of the genes which can change the amino acids being made
13) A. huntingtons disease
14) B. homozygous means both are the same, they will obviously have the disease if both jeans are positive.
15)A. that would mean everyone is homozygous for that trait, very infrequent
16)B
17)B
18)A
19)B i think this is false, not positive though
20)A i think this is true.
21)A
22)A
23)B???
24)B
25)i think B, but it depends, certain cancers are genetic.These questions are difficult because it can be both ways.
hope this helps 4) D Down syndrome is an extra chromosome 21
5) A - not positive though...
7) D
The sex-linked allele for colorblindness is located on
B. the X chromosome only.
13) A
14) C - its dominant
18) A - if both parents are heterozygous for Huntington's they may have offspring that is not affected.
23) A - pretty sure
Sorry I dont know them all, Hope this helps! |
