About Chromosomes

Following are some of the multiple choice questions on the Chromosomes with answers that will help the students in developing their knowledge.

Chromosomes MCQ

1. An organism’s genotype is its

  • stem height
  • feather color
  • genetic makeup
  • physical appearance

2. Walther Flemming noticed chromosome in the larvae of .........................

  • Tadpole
  • Salamanders
  • Bacteriophage
  • Amoeba

3. A segment of DNA

  • nucleosome
  • gene
  • histone
  • chromatin

4. The different forms of a gene are called

  • factors
  • alleles
  • masks
  • traits

5. A heterozygous organism has

  • three different alleles for a trait.
  • two identical alleles for a trait.
  • only one allele for a trait.
  • two different alleles for a trait.

6. If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb), what is the probability that an offspring will have black fur?

  • 25%
  • 50%
  • 75%
  • 100%

7. When sex cells combine to produce offspring, each sex cell will contribute

  • twice the number of chromosomes in body cells.
  • the normal number of chromosomes in body cells.
  • half the number of chromosomes in body cells.
  • one fourth the number of chromosomes in body cells.

8. The term “chromosomes” literally means

  • Inherited bodies
  • Twisted threads
  • Coloured bodies
  • Shining threads

9. Which of the following statements about homologous chromosomes is correct?

  • Each gene is at the same locus on both chromosomes.
  • They are two identical copies of a parent chromosome which are attached to one another at the centromere.
  • They come from the same parent.
  • They are chromosomes that have identical genes and alleles.

10. The substance that chromosomes are composed of is called

  • nucleosomes
  • DNA
  • chromatin
  • histones

11. Haploid in the number of chromosomes they contain (example: sperm or egg)

  • somatic cells
  • muscle cells
  • gametes
  • neurons

12. Made of chromatin and become visible during cell division

  • chromosomes
  • histones
  • mitochondria
  • nucleosomes

13. Determine the sex of an individual and are represented by XX or XY

  • sex chromosomes
  • autosomes
  • somatic cells
  • diploid cells

14. Body cells are also known as

  • prokaryotic cells
  • somatic cells
  • gametes
  • sperm or egg

15. A histone core with DNA wrapped around it is called a

  • somatic cell
  • gene
  • centromere
  • nucleosome

16. A picture or image of a person's chromosomes taken through a microscope

  • pedigree
  • centromere
  • karyotype
  • none are correct

17. Chromosomes that do not determine the sex of an individual

  • autosomes
  • sex chromosomes
  • gametes
  • chromatids

18. Gametes that contain one set of chromosomes (example: n = 23) are called

  • diploid
  • autosomes
  • haploid
  • somatic cells

19. A chromosome is composed of two identical sister

  • centromeres
  • chromatids
  • autosomes
  • somatic cells

20. The disc shaped protein core that DNA wraps around is called

  • histone
  • nucleosome
  • chromatin
  • gene

21. Cells that contain two sets of chromosomes (example: 2n = 46) are called

  • gametes
  • haploid
  • diploid
  • chromatin

22. Chromosomes contain genetic information in the form of

  • DNA
  • histone
  • centromere
  • karyotypes

23. Sister chromatids are held together by a

  • histone core
  • chromatin
  • nucleosome
  • centromere

24. What does the notation TT mean to a geneticist?

  • two dominant alleles
  • heterozygous alleles
  • at least one dominant allele
  • one dominant and one recessive allele

25. What is the probability of producing a tall pea plant from a genetic cross between two hybrid tall pea plants?

  • one in four
  • two in four
  • three in four
  • four in four

26. What does a Punnett square show?

  • all of Mendel’s discoveries about genetic crosses
  • only the recessive alleles in a genetic cross
  • only the dominant alleles in a genetic cross
  • all the possible outcomes of a genetic cross

27. What does the notation Tt mean to geneticists?

  • two dominant alleles
  • one dominant and one recessive allele
  • homozygous alleles
  • two recessive alleles

28. Factors that control traits are called

  • parents
  • genes
  • purebreds
  • recessives

29. Scientists call an organism that has two different alleles for a trait a

  • dominant
  • purebred
  • factor
  • hybrid

30. An organism that has two identical alleles for a trait is

  • homozygous
  • heterozygous
  • a phenotype
  • tall

31. What is probability?

  • the number of times a coin lands heads up
  • the actual results from a series of events
  • the way the results of one event affect the next event
  • a number that describes how likely it is that an event will occur

32. An organism’s physical appearance is its

  • dominance
  • genotype
  • phenotype
  • allele

33. Which term refers to physical characteristics that are studied in genetics?

  • offspring
  • traits
  • generations
  • hybrids

34. If a gene is found only on the X chromosome and not the Y chromosome, it is said to be what?

  • sex-linked trait
  • polygenic trait
  • codominant trait
  • incomplete dominance trait

35. Which statement is NOT true about Karyotypes

  • Chromosomes (pairs 1-22) are arranged by size
  • Sex chromosomes are found at the end
  • A normal karyotype has 46 chromosomes or 23 pairs
  • Having missing or extra chromosomes does not indicate a disorder

36. An abnormality in which homologous chromosomes fail to separate properly is called

  • glue syndrome
  • sticky-osis
  • nondisjunction
  • telophase

37. A nondisjunction resulting in three chromosomes in one position is called

  • monosomy
  • disomy
  • trisomy
  • polysomy

38. A nondisjunction resulting in one chromosome in one position is called

  • monosomy
  • disomy
  • trisomy
  • polysomy

39. The position of a gene on a chromosomes is the _______.

  • allele
  • gene locus

40. What is a nucleosome?

  • All the DNA and histones in a cell
  • chromatin that has been condensed
  • a histone with two coils of DNA wrapped around it
  • none of these

41. Genes that are located on the same chromosome

  • human genome project
  • pedigree
  • biology
  • linked genes

42. How many autosomes are there in a human sperm?

  • 1
  • 22
  • 23
  • 46

43. Chromosomes that have the same sequence of genes and the same structure are ___________.

  • homologous chromosomes
  • alleles
  • phenotypes
  • genotypes

44. Autosomes are

  • chromosomes found in autotrophs, only
  • chromosomes that automatically correct all errors in the DNA
  • chromosomes that determine traits other than sex
  • chromosomes that determine the sex of the individual

45. The 23rd pair of chromosomes that do determine the sex of an individual are called ___________.

  • sex chromosomes
  • autosomes
  • homologous
  • genes

46. The 2 male sex chromsomes are _____.

  • XY
  • XX

47. The 2 female sex chromosomes are ___.

  • XY
  • XX

48. A _______ is an egg that has been fertilized by a sperm cell.

  • gene
  • chromosome
  • zygote
  • embryo

49. Cells that contain only ONE set of chromosomes are called ________ (n).

  • diploid
  • polyploid
  • triploid
  • haploid

50. Cells that contain 2 sets of chromosomes are called _________ (2n).

  • diploid
  • haploid
  • triploid
  • polyploid

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