Mendelian Genetics

What are genes?

• units that carry instructions for traits
• the study of heredity
• threadlike structures in the nucleus
• genetic material that makes up genes

What is the meaning of homozygous?

• Combination of the same alleles
• Combination of different alleles
• Expressed with a single copy of the allele
• Requires two alleles to be expressed

What is the meaning of heterozygous?

• Combination of the same alleles
• Combination of the different alleles
• Expressed with a single copy of the allele
• Requires two alleles to be expressed

Define the term - Dominant allele.

• Combination of the same alleles
• Combination of different alleles
• Expressed with a single copy of the allele
• Requires two alleles to be expressed

Define the term - Recessive allele.

• Combination of the same alleles
• Expressed with a single copy of the allele
• Combination of the different alleles
• Requires two alleles to be expressed

Define genotype.

• Genetic make-up of a trait.
• Physical expression of a trait.
• Tool used to display potential probabilities for offspring.
• The amount of genes in a given population.

Define phenotype.

• Genetic make-up of a trait.
• Physical expression of a trait.
• Tool used to display potential probabilities for offspring.
• The amount of genes in a given population.

What is a Punnett Square?

• Genetic make-up of a trait.
• Physical expression of a trait.
• Tool used to display potential probabilities for offspring.
• The amount of genes in a given population.

Which genotype represents a recessive trait?

• AA
• Aa
• aa

Tall plants are dominant.  Which statement is true of the plant offspring using this Punnett Square?

• 50% of the offspring will be short.
• 75% of the offspring will be tall.
• 100% of the offspring will be heterozygous.
• 25% of the offspring will be tall.