Genetic Inheritance and Punnet Squares

Inheritance

Transmission of traits from parents to offspring.

Pangenes

Particles theorized by Aristotle in reproduction.

Miniature Person Theory

van Leeuwenhoek's idea of sperm containing a complete individual.

Egg Theory

de Graaf's proposal that eggs contain entire person.

Alleles

Different versions of a gene.

Dominant Allele

An allele that masks the effect of another.

Recessive Allele

An allele whose effect is masked by a dominant.

Genotype

Genetic makeup represented by letters.

Phenotype

Physical expression of a trait.

Homozygous

Identical alleles for a trait.

Heterozygous

Different alleles for a trait.

Punnet Square

Tool to predict offspring genotypes and phenotypes.

Brown Eye Allele

Dominant allele represented by 'B'.

Blue Eye Allele

Recessive allele represented by 'b'.

Genotypic Ratio

Ratio of different genotypes in offspring.

Phenotypic Ratio

Ratio of different phenotypes in offspring.

Tongue Rolling Gene

Gene where rolling is dominant (R) and non-rolling is recessive (r).

Homozygous Dominant

Genotype with two dominant alleles (e.g., RR).

Homozygous Recessive

Genotype with two recessive alleles (e.g., rr).

Hybrid

Another term for heterozygous genotype.

Purebred

Another term for homozygous genotype.

Darla's Genotype

Homozygous dominant for eye color.

Dan's Genotype

Heterozygous for eye color.

100% Rolling Children

Result of homozygous dominant and homozygous recessive parents.

0% Blue Eyed Child

No chance of blue-eyed offspring from Darla and Dan.