The flow diagram below is a representation of one pair of homologous chromosomes in a cell during meiosis - HSC - SSCE Biology - Question 23 - 2005 - Paper 1
Question 23
The flow diagram below is a representation of one pair of homologous chromosomes in a cell during meiosis.
(a) Identify ONE characteristic of the cells labelled D.
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Worked Solution & Example Answer:The flow diagram below is a representation of one pair of homologous chromosomes in a cell during meiosis - HSC - SSCE Biology - Question 23 - 2005 - Paper 1
Step 1
Identify ONE characteristic of the cells labelled D.
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Answer
The cells labelled D are haploid, meaning they contain only one set of chromosomes, which is half the number of chromosomes found in diploid cells.
Step 2
Identify what occurs in Process 1.
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Answer
In Process 1, homologous chromosomes undergo replication to form sister chromatids, preparing for the subsequent stages of meiosis.
Step 3
Identify where crossing over would occur, and explain how crossing over affects the inheritance of genes.
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Answer
Crossing over occurs during prophase I of meiosis, specifically at the chiasmata where homologous chromosomes are closely aligned. This process results in the exchange of genetic material between non-sister chromatids, leading to genetic variation in the offspring. It affects inheritance by producing new allele combinations, which can contribute to the diversity of traits in a population.
