Intro Genetics

We all have two alleles, or versions, of each gene. Being ​ (a)   for a particular gene means you inherited two identical versions. It's the opposite of a ​ (b)   genotype, where the alleles are different. People who have recessive traits, like blue eyes or red hair, are always homozygous for that gene.

• homozygous

• heterozygous

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​ (a)   are always expressed when the connected allele is dominant, even if only one copy of the dominant trait exists. ​ (b)   are expressed only if both the connected alleles are recessive.

• Dominant traits

• Recessive traits

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Which of the choices is homozygous dominant?

• BB

• Bb

• bb

Who was considered to be the father of Genetics?

• Charles Darwin

• Aristotle

• John Newton

• Gregor Mendel

Scientific study of heredity

• Genetics

• Heredity

• Anatomy

• Biology

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The scientific study of heredity.

• Biology

• Gene Therapy

• Genetic Counseling

• Genetics

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A mutation is

• any change that is harmful

• any change in a gene or chromosome

• any change that is helpful

• any change in the phenotype

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Two heterozygous (Tt) tall pea plants are crossed. Which describes their offspring?

• 50% tall and 50% short

• 75%tall and 25% short

• 100%short

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G = green, g = yellow
The genotype for a yellow plant is...

• GG

• Gg

• gg

• all of the choices result in yellow

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A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?

• Incomplete Dominance

• Co dominance

• Independent assortment

• Recessive inheritance

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