Mendelian Genetics

Passing on traits from parents to offspring

• Chromosome

• Genotype

• Heredity

• Allele

The study of heredity

• Genetics

• Genome

• Allele

• Punnett Square

The instruction of one allele covers up the instruction

of the other allele in a homologous pair. Symbolized by a capital letter.

• Recessive Allele

• Dominant Allele

• Heredity

• Trait

The instructions of this allele are covered up by the other allele in a homologous pair. Symbolized by a small letter.

• Homozygous

• Dominant

• Recessive

• Genetics

A genotype where one dominant and one recessive allele was passed on from both parents for one trait.

Bb Aa Tt Ll

• Allele

• Homozygous Dominant

• Homozygous Recessive

• Heterozygous

The observable traits dictated by the genotype

• Phenotype

• Genotype

• Homozygous Recessive

• Homozygous Dominant

During meiosis and gamete formation, homologous (paired up) alleles split up

• Phenotype

• Law of Segregation

• Genotype

• Dihybrid Cross

During meiosis, the homologous pairs of chromosomes and the matching alleles are lined up independently.

Offspring are a mix of maternal genes and paternal genes.

This increases genetic variation.

• Homozygous Dominant

• Law of Segregation

• Crossing Over

• Independent Assortment

What is the percentage of homozygous recessive offspring?

• 0%
• 25%
• 50%
• 75%

Green peas are dominant (G) to yellow peas (g). What is the genotype for a hetereozygous dominant offspring?

• Gg
• gg
• GG