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an individual heterozygous that is for a specific trait.


Graphic Representation of genetic inheritance used by genetics to map genetic traits.

Recessive Genetic Disorder

A recessive trait is expressed when the individual is homozygous recessice for the trait.

Cystic Fibrosis

The gene that codes for a membrane protein in defective


Genes do not produce normal amounts of the pigment melanin


Absence of the genes that codes for the enzyme that breaks down galactose.

Tay-Sachs Disease

Absence of a necessary enzyme that breaks down fatty substances

1. Huntingtons's Disease 2. Achondroplasia

Name some Dominant Genetic Disorders

Huntington's Disease

A gene affecting neurological function is defective


A gene that affects bone growth that is abnormal

Inferring Genotypes

What is it knowing physical traits that can determine what genes an individual is most likely to have

Predicting Disorders

Record keeping that helps scientists use pedigree analysis to study inheritance patterns, determine phenotypes, and ascertain genotypes.

Incomplete Domininance

Inheritance pattern where the phenotype of a heterozygote is intermediate between those of the two homozygote's

Codominnant Allele

The phenotypes of both homozygote's to be produced in heterozygous individuals

Multiple Alleles

Presence of more than two alleles for a genetic trait

Sex Chromosomes

Two chromosomes that determine the sex of an individual


22 pairs of homologous chromosomes

Sex linked trait

Traits controlled by genes located on sex chromosomes

Polygenic trait

The inheritance pattern of a trait that is controlled by two or more genes

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