10 Questions
Which of these genotypes is heterozygous?
Bb
Which of these is NOT a phenotype?
Homozygous
In a cross between individuals that are Aa×Aa, how many boxes of the Punnett square will show an offspring that is AA?
4
Which of these is NOT a way to express probability?
¾
What does a Punnett square show?
All the possible outcomes of a genetic cross
Which of these genotypes is homozygous?
AA
What is the genotype for a trait?
Genotype for a trait
What is an organism's physical appearance called?
Phenotype
Which of these is a way to express probability?
50 percent
What does a Punnett square show?
All the possible outcomes of a genetic cross
Study Notes
Genotype and Phenotype
- A genotype is heterozygous when it has two different alleles for a trait, e.g., Aa.
- An organism's physical appearance is called its phenotype.
- The genotype of a trait is the specific set of alleles an individual possesses.
Punnett Square
- A Punnett square is a graphical representation of the possible genotypes of offspring from a cross between two parents.
- A Punnett square shows the probability of different genotypes and phenotypes in offspring.
Probability
- Probability can be expressed as a decimal, percentage, or ratio.
- Probability cannot be expressed as a sentence or a word.
Genotype Combinations
- In a cross between Aa × Aa individuals, only one box of the Punnett square will show an offspring that is AA.
Test your knowledge on probability and heredity with this grade 7 quiz. Answer questions on genotypes, phenotypes, and Punnett squares to see how well you understand these concepts.
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