VVHS Mendelian Genetics

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What is a phenotype?

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A phenotype is the observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences. Example: red hair.

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What is heredity?

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Heredity is the passing of traits from parents to offspring.

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What does homozygous recessive mean?

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Homozygous recessive refers to having two identical alleles for a trait that are both recessive. Example: tt.

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Who is known as the Father of Genetics?

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Gregor Mendel is considered the Father of Genetics for his work on inheritance patterns in pea plants.

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What is a Punnett Square?

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A Punnett Square is a diagram used to predict the genotype and phenotype combinations of a genetic cross.

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What is an allele?

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An allele is a variant form of a gene that can produce different traits. Example: T (tall) and t (short) are alleles for plant height.

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What is the difference between genotype and phenotype?

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Genotype refers to the genetic makeup of an organism, while phenotype refers to the physical expression of that genetic makeup.

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What is a dominant allele?

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A dominant allele is an allele that expresses its trait even when only one copy is present. Example: T in Tt.

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What is a recessive allele?

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A recessive allele is an allele that only expresses its trait when two copies are present. Example: t in tt.

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What is a homozygous genotype?

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A homozygous genotype has two identical alleles for a trait. Example: TT or tt.