Genetic Definitions

Heredity

The passing of traits from parents to offspring

Gene

The set of information that controls a trait; a segment of DNA on a chromosome that codes for a specific trait.

100%

What is the probability of the offspring having the dominant phenotype when one parent is homozygous dominant and the other is homozygous recssive?

Rr

What will the genotype be when a homozygous dominant mother is crossed with a homozygous recessive father. (Using the letter "R")

Recessive allele (definition)

an allele that can be hidden by another allele

Dominant allele (definition)

an allele that can hide the affects of another allele(can be homozygous or heterozygous for that trait)

Heterozygous (definition)

an organism inherited 2 different alleles from their parents

Homozygous (definition)

an organism inherited 2 identical alleles from their parents

Genotype (definition)

an organism's combination of alleles

Phenotype (definition)

an organism's observable traits

Heterozygous alleles are represented by

An upper and a lower case letter

Trait

A characteristic that an organism can pass on to its offspring through its genes.

Punnett Square

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

Chromosome

A doubled rod of condensed chromatin; contains DNA that carries genetic information.

Recessive alleles are represented by

Lowercase letters

Dominant alleles are represented by

Uppercase letters

50%

What is the probability of the offspring having a heterozygous genotype when both parents are heterozygous?

25%

What is the probability of the offspring having a homozygous recessive genotype when both parents are heterozygous?

Allele (definition)

different versions of the same gene