Mendelian Genetics and Pedigrees

18 terms by dcabrera Teacher

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Gregor Mendel

Father of genetics. Experimented with pea plants and discovered law of dominance

Punnett Square

diagram showing the gene combinations that might result from a genetic cross

Cross

To breed two individuals

Trait

Specific characteristic that varies from one individual to another

Heritable trait

Trait that is passed from parent to offspring

Alleles

The different forms of a gene.

Dominant

trait that will show up in an organism's phenotype if gene is present

Recessive

trait of an organism that can be masked by the dominant form of a trait

Genotype

The particular alleles at present in an organism

Phenotype

Physical characteristics

Homozygous

Having two identical alleles for a trait
for example: HH or hh

Heterozygous

Having two different alleles for a trait
for example: Hh

Complete Dominance

A relationship in which one allele is completely dominant over another

Incomplete Dominance

creates a BLENDED phenotype; one allele is not completely dominant over the other

Co-Dominance

creates a phenotype in which BOTH alleles for a gene are fully expressed.

Pedigree

Diagram that shows the occurrence of a HERITABLE TRAIT in several generations of a family

Male

Represented by squares in a pedigree.

Female

Represented by circles in a pedigree.

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