Bio 1-2: Genetics and Punnett Squares

What is a GENOTYPE?

• the genetic make-up of an organism

• the physical trait of an organism

• mitosis

• meiosis

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

PHENOTYPE is

• the genetic make-up of an organism

• the physical trait of an organism

• nucleic acid

• Aa

Tags

NGSS.HS-LS3-1

Which of the following represents alleles for the homozygous dominant genotype?

• Aa

• aa

• AA

Which of the following represents alleles for the homozygous recessive genotype?

• Aa

• aa

• AA

Tags

NGSS.HS-LS3-1

Which of the following represents alleles for the heterozygous genotype?

• Aa

• aa

• AA

Tags

NGSS.HS-LS3-1

If A = red fur and a = white fur, what are the PHENOTYPIC ratios of the offspring based on the Punnett Square?

• 25% heterozygous

• 50% purple

• 75% red fur and 25% white fur

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

Tags

NGSS.HS-LS3-3

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

NGSS.HS-LS3-2

Two heterozygous white(brown fur is recessive) rabbits are crossed. What is the phenotype of the offspring?

• 75% white; 25% brown
• 25% white; 75 % brown

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

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?

• genotype= 100% homozygous dominant;

  phenotype= 100% tall

• genotype= 50% homozygous dominant, 50% heterozygous;

  phenotype= 100% tall

• genotype= 25% heterozygous, 75% homozygous dominant

  phenotype= 100% tall

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

T - tall and t = short
In the punnett square below, what belongs in the missing square

• tt
• Tt
• Bb
• TT

Tags

NGSS.HS-LS3-1