What proportion of chromosomes in a man's skin cell are maternal chromosomes?

검증된 단계별 안내

Step 1: Understand the basics of chromosome inheritance. In humans, we have 46 chromosomes in total. These chromosomes are in pairs, so we have 23 pairs of chromosomes. One chromosome from each pair is inherited from the mother (maternal), and the other one is inherited from the father (paternal).

Step 2: Calculate the proportion of maternal chromosomes. Since one chromosome from each pair is maternal, half of the chromosomes in a cell are maternal. Therefore, the proportion of maternal chromosomes in a cell is 1/2 or 50%.

Step 3: Apply this understanding to the specific question. In a man's skin cell, which is a somatic cell and contains 46 chromosomes, half of these chromosomes (23 out of 46) are maternal.

Step 4: Express this as a proportion. The proportion of maternal chromosomes in a man's skin cell is therefore 23/46, which simplifies to 1/2 or 50%.

Step 5: Final answer. Therefore, the proportion of chromosomes in a man's skin cell that are maternal chromosomes is 50%.

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주요 개념

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Chromosomes

Chromosomes are long, thread-like structures made of DNA and proteins that carry genetic information. In humans, each cell typically contains 46 chromosomes, organized into 23 pairs. One chromosome of each pair is inherited from the mother, and the other from the father, making them crucial for understanding genetic inheritance.

Diploid Cells

Human somatic cells, such as skin cells, are diploid, meaning they contain two sets of chromosomes—one from each parent. This results in a total of 46 chromosomes in these cells. Understanding the diploid nature of somatic cells is essential for determining the proportion of maternal and paternal chromosomes.

Maternal and Paternal Chromosomes

In the context of human genetics, maternal chromosomes refer to the chromosomes inherited from the mother, while paternal chromosomes are those inherited from the father. In a diploid cell, half of the chromosomes (23 out of 46) are maternal, which is key to answering questions about genetic contributions from each parent.