Non-Mendelian Genetics

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What is Non-Mendelian Genetics?

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Non-Mendelian Genetics refers to patterns of inheritance that do not follow Mendel's laws of inheritance, including concepts like incomplete dominance, codominance, and multiple alleles.

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What is the definition of a recessive trait?

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A recessive trait is one that is expressed in the phenotype only when two copies of the recessive allele are present (homozygous recessive).

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What is a dominant trait?

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A dominant trait is one that is expressed in the phenotype even when only one copy of the dominant allele is present (heterozygous or homozygous dominant).

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What is a pedigree chart?

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A pedigree chart is a diagram that shows the occurrence and appearance of phenotypes of a particular gene or organism and its ancestors.

Tags

NGSS.HS-LS3-1

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What does codominance mean?

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Codominance is a form of inheritance where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive.

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What is incomplete dominance?

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Incomplete dominance is a genetic situation in which one allele does not completely dominate another allele, resulting in a new phenotype that is a blend of the two.

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What is the genotype of an individual with a recessive trait?

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The genotype of an individual with a recessive trait must be homozygous recessive (e.g., 'hh').

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How can you determine if a trait is dominant or recessive using a pedigree?

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If the trait skips generations and is only expressed when both parents carry the recessive allele, it is likely recessive. If it appears in every generation, it is likely dominant.

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What is the significance of the F1 generation in genetics?

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The F1 generation is the first filial generation, which is the result of a cross between two parental (P) generations. It is used to study inheritance patterns.

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What is the expected phenotypic ratio in a monohybrid cross?

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The expected phenotypic ratio in a monohybrid cross of two heterozygous parents (Aa x Aa) is 3:1.