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The diagram represents one pair of homologous chromosomes during meiosis - HSC - SSCE Biology - Question 10 - 2001 - Paper 1

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The diagram represents one pair of homologous chromosomes during meiosis. Crossing-over occurs and random segregation takes place. What genotypes are produced? (A)... show full transcript

Worked Solution & Example Answer:The diagram represents one pair of homologous chromosomes during meiosis - HSC - SSCE Biology - Question 10 - 2001 - Paper 1

Step 1

Identify the Genotypes from the Diagram

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Answer

The diagram illustrates two homologous chromosomes with alleles represented as follows:

  • One chromosome carries alleles A, B, and G.
  • The other carries a, b, and g.

During meiosis, crossing-over results in the exchange of genetic material between homologous chromosomes.

Step 2

Determine the Resulting Genotypes After Crossing Over

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Answer

The possible recombinations of alleles after crossing-over will produce the following combinations:

  • From the first chromosome: ABG
  • From the second chromosome: abg
  • Additionally, phenotypes can resemble abG and ABg due to the combinations from crossing over.

This leads to the genotypes being:

  1. ABG
  2. abG
  3. ABg
  4. abg

Step 3

Choose the Correct Answer

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Answer

Based on the possible genotypes derived from crossing-over, the correct answer from the options given is:

(A) ABG, abG, ABg, abg

This matches with the analysis of the genotypes obtained through the process described.

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