Melanin/Genetics Unit #1

Albinism

• Absence of pigment in the skin, hair, and eyes

• Different versions of a gene (represented by different letters)

• Having two different alleles (Aa)

• Instructions (recipes) found in DNA for building proteins.

Punnet Square

• Having two of the same allele (AA, aa)

• A diagram that shows the occurrence of a genetic trait in several generations of a family.

• Organism's inherited appearance

• A chart that shows all the possible combinations of alleles that can result from a genetic cross

Pedigree

• A chart that shows all the possible combinations of alleles that can result from a genetic cross

• A diagram that shows the occurrence of a genetic trait in several generations of a family.

• Visible when one or more dominant alleles are inherited (AA, Aa)

• Inherited combination of alleles (AA, Aa, aa)

Recessive Trait

• Organism's inherited appearance

• Visible when one or more dominant alleles are inherited (AA, Aa)

• Only visible when two recessive alleles are inherited (aa)

• Having two different alleles (Aa)

Genes

• A chart that shows all the possible combinations of alleles that can result from a genetic cross

• Organism's inherited appearance

• Different versions of a gene (represented by different letters)

• Instructions (recipes) found in DNA for building proteins.

Dominant Trait

• Visible when one or more dominant alleles are inherited (AA, Aa)

• Only visible when two recessive alleles are inherited (aa)

• Organism's inherited appearance

• Different versions of a gene (represented by different letters)

Alleles

• A chart that shows all the possible combinations of alleles that can result from a genetic cross

• A diagram that shows the occurrence of a genetic trait in several generations of a family.

• Different versions of a gene (represented by different letters)

• Absence of pigment in the skin, hair, and eyes

Heterozygous

• Having two of the same allele (AA, aa)

• Having two different alleles (Aa)

• Organism's inherited appearance

• Only visible when two recessive alleles are inherited (aa)

Genotype

• Inherited combination of alleles (AA, Aa, aa)

• Organism's inherited appearance

• Having two of the same allele (AA, aa)

• A chart that shows all the possible combinations of alleles that can result from a genetic cross

Homozygous

• Instructions (recipes) found in DNA for building proteins.

• Having two different alleles (Aa)

• Having two of the same allele (AA, aa)

• A chart that shows all the possible combinations of alleles that can result from a genetic cross