ET Pedigrees 3/31/25

The shaded shapes represent individuals with attached earlobes (ee). What is the genotype of the generation I parents?

• ee

• Ee

• EE

• It is not possible to determine

Tags

NGSS.HS-LS3-1

If this recessive pedigree, what MUST the genotype of individual 4 be?

• RR

• Rr

• rr

• R ?

Answer explanation

Individual 4 must have the genotype rr because they are showing the recessive trait in the pedigree, which means they must have two copies of the recessive allele.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If this recessive disorder pedigree, what MUST the genotype of individual 2 be?

• RR

• Rr

• rr

• R ?

Answer explanation

Individual 2 must be heterozygous (Rr) to show the recessive trait in the pedigree. If individual 2 was homozygous dominant (RR), the trait would not be expressed.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the genotype of D?

• RR

• Rr

• R ?

• rr

Answer explanation

The genotype of D is Rr because it shows a dominant trait (R) and a recessive trait (r), making it heterozygous.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the genotype of the mother?

• BB

• bb

• Bb

• BB or Bb

Answer explanation

The correct genotype of the mother is Bb because she must pass on one 'B' allele and one 'b' allele to her child, resulting in a heterozygous genotype.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the genotype of C?

• RR

• Rr

• R ?

• rr

Answer explanation

The genotype of C is Rr because it shows a dominant trait (R) and a recessive trait (r), making it heterozygous.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2