Genetics: Punnett Squares

A tall plant (Tt) is crossed with a short plant (tt). What is the phenotype of the offspring?

• 75% tall; 25% short
• 25% tall; 75% short
• 50% tall; 50% short
• 100% tall

Tags

NGSS.HS-LS3-3

Two heterozygous red flowers (white flowers are recessive) are crossed. What are the gentoypes and phenotypes of the offspring?

• 75% homozygous dominant; 25% heterozygous

• 50% homozygous dominant; 50% heterozygous

• 25% homozygous dominant; 25% homozygous recessive; 50% heterozygous

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Two heterozygous red flowers (white flowers are recessive) are crossed. What is the phenotype of the offspring?

• 50% red; 50% white
• 75% white; 25% red
• 25% red; 25% pink; 50% white
• 75% red; 25% white

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A homozygous tall plant (TT) is crossed with a heterozygous tall plant (Tt) (short is the recessive phenotype). What are the genotypes and phenotypes of the offspring?

• 100% homozygous dominant; 100% tall
• 50% homozygous dominant; 50% heterozygous and 100% tall
• 25% heterozygous; 75% homozygous dominant and 100% tall

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A heterozygous white rabbit is crossed with a homozygous black rabbit. List the parent genotypes; draw and fill and Punnett square, and then list the offspring genotypes and phenotypes. 

• genotype-25% heterozygous; 75% homozygous recessive and phenotype-50% white and 50% black
• genotype- 50% heterozygous; 50% homozygous recessive and phenotype- 50% white and 50% black

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A tall plant (Tt) is crossed with a short plant (tt). What are the genotypes and phenotypes of the offspring?

• 25% heterozygous; 75% homozygous

• 100% homozygous dominant

• 100% heterozygous

• 50% heterozygous; 50% homozygous recessive

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A white flower (rr) is crossed with a white flower (rr). What is the genotype of the offspring? 

• 100% homozygous dominant
• 100% heterozygous dominant
• 100% homozygous recessive
• 100% heterozygous recessive

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A white flower (rr) is crossed with a white flower (rr). What is the phenotype of the offspring? 

• 100% white
• 75% white; 25% red
• 75% red; 25% white
• 100% red

Tags

NGSS.HS-LS3-1

A black chicken (BB) is crossed with a black chicken (BB). What is the genotype and phenotype of the offspring? 

• 100% heterozygous; 50% black
• 100% homozygous dominant; 100% black

Tags

NGSS.HS-LS3-1

A red flower (Rr) is crossed with a white flower (rr). What is the genotype of the offspring? 

• 50% heterozygous; 50% homozygous dominant
• 100% homozygous dominant
• 100% homozygous recessive
• 50% heterozygous; 50% homozygous recessive

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2