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Genetic diversity can arise as a result of mutation or during meiosis

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Question 1

Scientists studied the occurrence of chromosomal non-disjunction during oogenesis in two different cohorts of women: Cohort A and Cohort B.

The total number of non-disjunction errors recorded in each cohort was:

  • Cohort A: 380 errors
  • Cohort B: 650 errors

The table below shows the percentage of these errors that occurred in the first meiotic division (MIMIMI) and the second meiotic division (MIIMIIMII).

CohortTotal errorsPercentage of errors in MIMIMI (%)Percentage of errors in MIIMIIMII (%)
Cohort A3807525
Cohort B6502872

A student concluded that there were more errors in MIMIMI in Cohort B than in Cohort A because Cohort B had a significantly larger total number of errors.

Using the data in the table and suitable calculations, show why this conclusion is not valid.

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Genetic diversity can arise as a result of mutation or during meiosis Questions

  1. A Level
  2. /Biology
  3. /Genetic diversity can arise as a result of mutation or during meiosis