✅ 7th Grade Life Science: Genetics and Punnett Squares Quiz

What is the study of how traits are passed from parents to offspring called?

Which term describes a segment of DNA that codes for a specific trait?

If an organism has two identical alleles for a trait, what is its genotype called?

In genetics, what does a capital letter (e.g., 'T') usually represent?

A Punnett square helps predict the possible genetic outcomes of what?

If a dominant allele for tallness is 'T' and a recessive allele for shortness is 't', what is the phenotype of an organism with the genotype 'Tt'?

A plant has a dominant allele for red flowers (R) and a recessive allele for white flowers (r). If a homozygous dominant red flower (RR) is crossed with a homozygous recessive white flower (rr), what percentage of the offspring will have red flowers?

In guinea pigs, black fur (B) is dominant over white fur (b). If a heterozygous black guinea pig (Bb) is crossed with a homozygous white guinea pig (bb), what are the possible genotypes of the offspring?

Two heterozygous tall pea plants (Tt) are crossed. What is the expected genotypic ratio of the offspring?

If brown eyes (B) are dominant over blue eyes (b), and two parents are both heterozygous (Bb), what is the probability that their child will have blue eyes?

A Punnett square shows the cross between two parents. If the top row has 'A' and 'a', and the left column has 'A' and 'a', what will be the genotype in the box where 'a' from the top meets 'a' from the side?

A scientist crosses a purple-flowered plant with a white-flowered plant. All the offspring have purple flowers. If purple (P) is dominant over white (p), what were the most likely genotypes of the parent plants?

In a certain type of fish, striped scales (S) are dominant over solid scales (s). If a cross between two fish produces 75% offspring with striped scales and 25% with solid scales, what must be the genotypes of the parent fish?

A true-breeding tall pea plant (TT) is crossed with a true-breeding short pea plant (tt). The F1 generation are all tall. If two F1 generation plants are crossed, what is the probability that an F2 offspring will be homozygous recessive?