Genotype and Phenotype Ratios and Percents ( Punnett Square Basics)

What is the observable physical characteristic of an organism called?

• Genotype

• Allele

• Phenotype

• Chromosome

Which term describes an allele that always shows its trait when present?

• Recessive

• Heterozygous

• Dominant

• Homozygous

What percentage of offspring from a cross between a homozygous dominant brown mouse and a heterozygous brown mouse will have brown fur?

• 25%

• 50%

• 75%

• 100%