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What is a pedigree chart?

Back

A pedigree chart is a diagram that shows the occurrence and appearance of phenotypes of a particular gene or organism and its ancestors, used to analyze the inheritance of traits.

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What does it mean to be a carrier of a trait?

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A carrier of a trait is an individual who has one copy of a recessive allele that does not manifest in the phenotype but can be passed on to offspring.

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What is the difference between dominant and recessive alleles?

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Dominant alleles are expressed in the phenotype even when only one copy is present, while recessive alleles are only expressed when two copies are present.

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How can you determine the genotype of an individual from a pedigree chart?

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The genotype can often be inferred from the phenotypes of the individual and their relatives, considering the inheritance patterns.

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What does shading in a pedigree chart typically represent?

Back

Shading in a pedigree chart usually represents individuals who express a particular trait, while unshaded individuals do not.

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What is the significance of generation numbers in a pedigree chart?

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Generation numbers indicate the lineage and help track the inheritance of traits through different generations.

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How are siblings represented in a pedigree chart?

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Siblings are typically represented by connecting lines that branch off from a horizontal line between their parents.

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What is the purpose of using pedigree charts in genetics?

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Pedigree charts are used to track the inheritance of traits, identify carriers, and assess the risk of genetic disorders in families.

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What does it mean if a trait skips a generation in a pedigree chart?

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If a trait skips a generation, it may indicate that the trait is recessive and that carriers in the previous generation did not express the trait.

Front

How can you identify cousins in a pedigree chart?

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Cousins can be identified as individuals who share a set of grandparents but have different parents.