Photo AI
The diagram represents one pair of homologous chromosomes during meiosis - HSC - SSCE Biology - Question 10 - 2001 - Paper 1
Question 10
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
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
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:
- ABG
- abG
- ABg
- abg
Step 3