Genetics Review

An organism's phenotype describes its __________.

• genetic makeup
• physical appearance

What do you call a section of DNA that codes for a specific trait?

• nucleus
• chromosome
• gene
• DNA

__________ worked with pea plants to prove that traits are passed from parent to offspring.

• Reginald Punnett
• Gregor Mendel

What is the phenotype in the bottom right square? (Yellow is dominant and green is recessive)

• yy
• Yy
• yellow
• green

Which of the following is the genotype for a homozygous recessive trait?

• gg
• Gg
• GG

What % of the offspring in the Punnet square are heterozygous?

• 25%
• 50%
• 75%
• 100%

What type of letters are used to show a trait is dominant?

• capital
• lowercase

pp is an example of why type of genotype?

• homozygous recessive
• heterozygous recessive
• homozygous dominant
• heterozygous dominant

PP is what type of genotype?

• homozygous recessive
• heterozygous recessive
• homozygous dominant
• homozygous recessive

What is one or more alternative forms of a gene?

• chromosome
• genotype
• phenotype
• allele