Lesson 33: Non-Mendelian Inheritance

Different forms of a gene are called __________

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Polygenic literally means -

• Having two different alleles of a gene

• Expressed only in the absence of a dominant allele

• Alleles assort independently

• Having many genes

Select all statements below that describe non-Mendelian inheritance.

• Three or more alleles may control the expression of a trait

• It applies the principle of dominance

• Two different alleles can be equally dominant

• Traits may blend to produce a third phenotype

A pattern of inheritance in which a third unique phenotype is produced is called -

• homozygous recessive

• roan

• codominance

• dominance and recessiveness

In heterozygous individuals, codominant alleles express two traits simultaneously, which means they are expressed -

• immediately

• in different ways

• one after the other

• at the same time

In the genotype I^AI^B, which codes for the blood type AB in humans, is an example of -

• dominance and recessiveness

• simple inheritance

• codominance

• incomplete dominance

Polygenic traits -

• are controlled by more than two sets of genes

• occur only in cattle or horses

• produce harmful mutations

• are dominant and recessive

Which of the following is an example of incomplete dominance?

• spotted (roan) coloration in cattle from red and white parents

• intermediate skin color from dark- and light-skinned parents

• a hybrid pink flower from red and white parents

• type AB blood from type A and type B parents

In the case of incomplete dominance, a cross between two heterozygous individuals yields a phenotypic and genotypic ratio of -

• 3:1

• 2:2

• 4:4

• 1:2:1

The collection of characters transmitted from parents to offspring is called -

• inheritance

• gene

• hybrid

• codominance

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