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1
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2
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3
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4
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- A chromosome is one of the threadlike "packages" of genes and
other DNA in the nucleus of a cell.
- Different kinds of organisms have different numbers of chromosomes.
- Humans have 23 pairs of chromosomes, 46 in all: 44 autosomes and two sex
chromosomes.
- Each parent contributes one chromosome to each pair, so children get
half of their chromosomes from their mothers and half from their
fathers.
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5
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6
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- A gene is the functional and physical unit of heredity passed from
parent to offspring.
- Genes are pieces of DNA, and most genes contain the information for
making a specific protein.
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7
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8
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- A genome is all the DNA contained in an organism or a cell, which
includes the chromosomes plus the DNA in mitochondria (and DNA in the
chloroplasts of plant cells).
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9
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Notes
