Punnett square practice

Quiz

•

Biology

•

9th - 12th Grade

•

Practice Problem

•

Hard

•

NGSS

HS-LS3-1, HS-LS3-3

Standards-aligned

Lakia Greer Harrison

Used 6K+ times

FREE Resource

About this resource

This quiz focuses on Mendelian genetics, specifically the use of Punnett squares to predict inheritance patterns in monohybrid crosses. The content is appropriate for high school biology students in grades 9-12, as it requires understanding of fundamental genetic principles including dominance, recessiveness, homozygous and heterozygous genotypes, and the distinction between genotype and phenotype. Students need to master key concepts such as allele notation using uppercase letters for dominant traits and lowercase for recessive traits, the ability to set up and interpret Punnett squares for various crosses, and the mathematical relationships that emerge from basic Mendelian inheritance (1:1 ratios in testcrosses, 3:1 phenotypic ratios and 1:2:1 genotypic ratios in heterozygous crosses). The questions systematically build from simple dominant-recessive crosses to more complex scenarios requiring students to identify appropriate genetic notation and predict both genotypic and phenotypic outcomes. Created by Lakia Greer Harrison, a Biology teacher in the US who teaches grades 9-12. This quiz serves as an excellent tool for reinforcing genetic problem-solving skills and can be effectively used as a formative assessment after introducing Punnett square methodology, as homework practice to strengthen students' ability to work through genetic crosses independently, or as a warm-up review before advancing to more complex genetic concepts like dihybrid crosses or sex-linked inheritance. The systematic progression from phenotype predictions to genotype identification makes it particularly valuable for identifying specific areas where students need additional support in genetic reasoning. This assessment aligns with NGSS standard HS-LS3-3 (Apply concepts of statistics and probability to explain variation and distribution of traits in a population) and supports the development of mathematical thinking within biological contexts as students calculate probability ratios in genetic crosses.

6 questions

Show all answers

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Tall is dominant to short. A homozygous tall plant is crossed with a short plant. What will be the phenotypes of the offspring?

100% tall

50% tall, 50% short

75% tall, 25% short

25% tall, 75% short

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Green is dominant to yellow. Two heterozygous green plants are crossed. What are the genotypes of the offspring?

100% Gg

50% GG, 50% Gg

25% GG, 50% Gg, 25% gg

75% Gg, 25% gg

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Purple is dominant to white. A heterozygous purple flower is crossed with a white flower. What are the genotypes and phenotypes of the offspring?

100% Pp (purple)

50% Pp (purple); 50% pp (white)

75% Pp (purple); 25% pp (white)

25% PP, 50% Pp, 25% pp
75% purple, 25% white

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In humans, brown eyes are dominant over blue eyes. What would be the allele key you would make from this information?

B-brown
b-blue

B-blue
b-brown

BB-brown
Bb-blue

bb-brown
Bb-blue

Tags

NGSS.HS-LS3-1

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

If brown eyes are dominant over blue eyes, what would be the parent genotypes if two heterozygous brown eyed persons were crossed?

BB and bb

BB and Bb

Bb and Bb

bb and Bb

Tags

NGSS.HS-LS3-1

MULTIPLE CHOICE QUESTION

1 min • 1 pt

If brown eyes are dominant to blue eyes, what would be the genotype of the offspring if a homozygous brown eyed individual is crossed with a homozygous blue eyed?

BB and bb

Tags

NGSS.HS-LS3-1

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