DP Biology Questionbank

Description

Nature of science:
Making careful observations—careful observation and record keeping turned up anomalous data that Mendel’s law of independent assortment could not account for. Thomas Hunt Morgan developed the notion of linked genes to account for the anomalies. (1.8)Understandings:

• Chromosomes replicate in interphase before meiosis.
• Crossing over is the exchange of DNA material between non-sister homologous chromatids.
• Crossing over produces new combinations of alleles on the chromosomes of the haploid cells.
• Chiasmata formation between non-sister chromatids can result in an exchange of alleles.
• Homologous chromosomes separate in meiosis I.
• Sister chromatids separate in meiosis II.
• Independent assortment of genes is due to the random orientation of pairs of homologous chromosomes in meiosis I.

Applications and skills:

• Skill: Drawing diagrams to show chiasmata formed by crossing over.

Guidance:

• Diagrams of chiasmata should show sister chromatids still closely aligned, except at the point where crossing over occurred and a chiasma was formed.

Utilization:
Syllabus and cross-curricular links:
Biology
Topic 1.6 Cell division
Topic 3.3 Meiosis
Topic 11.4 Sexual reproduction

Aims:

• Aim 6: Staining of lily anthers or other tissue containing germ-line cells and microscope examination to observe cells in meiosis are possible activities.

Directly related questions

• 17M.1.SL.TZ1.1: Which structure found in eukaryotes has a single membrane? A. Nucleus B. Lysosome C....
• 17M.1.HL.TZ1.35: Which gametes can result from the following crossover?        
• 17M.1.HL.TZ2.19: The genetic determination of dogs’ coats can be quite complex, with many different genes acting...
• 17M.2.HL.TZ2.8b: Draw a labelled diagram of the formation of a chiasma by crossing over.
• 20N.1.HL.TZ0.35: Andalusian fowl have varied colours and types of feathers. The allele for black feathers is...
• 17N.2.HL.TZ0.05b: Explain the reason for linked genes not following the pattern of inheritance discovered by Mendel.
• 21M.1.HL.TZ1.35: Which statement is valid regarding chromatids? A. Sister chromatids separate during meiosis...
• 21M.1.HL.TZ2.35: What process occurs in both mitosis and meiosis? A. Formation of chiasmata B. Reduction...
• 21N.2.HL.TZ0.2b.i: Draw the same chromosomes to show their structure at the same stage of meiosis if there had been...
• 21N.2.HL.TZ0.2b.ii: State the stage of meiosis where chiasmata formation may occur.
• 22M.1.HL.TZ2.35:

  When a cell divides by meiosis, chiasmata can be observed. Which are features of chiasmata?

  I. They are points of attachment between chromatids of non-homologous chromosomes.

  II. They occur during meiosis I.

  III. They increase stability of bivalents.

  A. I and II only

  B. I and III only

  C. II and III only

  D. I, II and III

• 18M.1.HL.TZ1.10: What is always passed to the next generation as a result of sexual reproduction? A. Homologous...
• 18M.1.HL.TZ2.17: Which process could cause non-disjunction if it occurred during meiosis? A. Sister chromatids do...
• 18M.1.HL.TZ1.35: What forms when two different chromatids of the same homologous pair cross over? A. Daughter...
• 18M.2.HL.TZ2.3a.ii: Outline the law of independent assortment.
• 18M.2.HL.TZ2.3a.i: The micrograph shows a plant cell of Lilium grandiflorum during meiosis. Identify, giving...
• 19N.1.HL.TZ0.35: Which event happens in meiosis II but not in meiosis I? A. Spindle microtubules attach to...