In a male somatic cell, the gonosomes (sex chromosomes) are an X chromosome and a Y chromosome. These are typically shown in their replicated, condensed form (an X-shape) as they would appear during cell division.
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X Chromosome: This is a relatively large chromosome, often appearing submetacentric (with the centromere slightly off-center). It consists of two identical sister chromatids joined at the centromere. Each chromatid has a short arm (p arm) and a long arm (q arm).
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Y Chromosome: This is a much smaller chromosome compared to the X, typically acrocentric (with the centromere very close to one end). Like the X, it also has two sister chromatids joined at a centromere, with a distinct short arm (p arm) and long arm (q arm). The SRY gene, which is crucial for male development, is located on the short arm of the Y chromosome.
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Key Labels for the Diagram:
- X chromosome
- Y chromosome
- Centromere (the constricted region joining sister chromatids)
- Sister chromatids (the two identical halves of a replicated chromosome)
- Short arm (p arm)
- Long arm (q arm)
- SRY gene (located on the Y chromosome's short arm)
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