Non-Mendelian Genetics

Front

What is Non-Mendelian Genetics?

Back

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

Front

Define Codominance.

Back

Codominance is a genetic scenario where both alleles in a heterozygote are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive, such as speckled flowers (RB).

Front

What is Incomplete Dominance?

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Incomplete dominance is a form of inheritance where the phenotype of a heterozygote is intermediate between the phenotypes of the two homozygotes, such as a red flower (RR) crossed with a white flower (WW) producing pink flowers (RW).

Front

What is a Phenotypic Ratio?

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A phenotypic ratio is the ratio of different phenotypes that appear in offspring from a genetic cross.

Front

What is the phenotypic ratio when crossing a red flower (RR) with a speckled flower (RB)?

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The phenotypic ratio is 2 red (RR) to 2 speckled (RB).

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How many carriers are present in the second generation if 3 individuals are carriers of a trait?

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There are 3 carriers of the trait in the second generation.

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What does a shaded individual in a pedigree represent?

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A shaded individual in a pedigree typically represents an individual expressing a particular trait, which can be dominant or recessive.

Front

Is the trait represented by shaded individuals in a pedigree dominant or recessive if the answer is recessive?

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The trait is recessive.

Front

If a pedigree shows an autosomal recessive disorder, what must the genotype of individual II-3 be?

Back

The genotype of individual II-3 must be hh.

Front

What is the difference between dominant and recessive traits?

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Dominant traits are expressed in the phenotype even if only one allele is present, while recessive traits are expressed only when two copies of the allele are present.