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Life ScienceGrade 7-9

Inheritance and Punnett Squares Answer Key

Use Punnett squares to predict how traits are passed from parents to offspring.

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Basic Genetics

Q1.What's the difference between genotype and phenotype?

Answer

Genotype is the genetic code (like Bb), phenotype is what you actually see (like brown eyes).

Q2.What does homozygous mean?

Answer

Having two identical alleles for a trait (BB or bb).

Q3.What does heterozygous mean?

Answer

Having two different alleles for a trait (Bb).

Using Punnett Squares

Q4.If both parents are Bb, what's the chance their kid is bb?

Q5.What's a dominant allele?

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