Genotypes

heterozygous

• RR

• rr

• Rr

Answer explanation

Heterozygous refers to having two different alleles for a trait. In this case, 'Rr' represents one dominant allele (R) and one recessive allele (r), making it the correct choice. 'RR' and 'rr' are homozygous.

Tags

NGSS.HS-LS3-2

NGSS.HS-LS4-3

homozygous recessive

• RR

• rr

• Rr

Answer explanation

The term 'homozygous recessive' refers to an organism with two identical recessive alleles. In this case, 'rr' represents homozygous recessive, while 'RR' is homozygous dominant and 'Rr' is heterozygous.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

homozygous dominant

• RR

• rr

• Rr

Answer explanation

The term 'homozygous dominant' refers to an organism with two identical dominant alleles. In this case, 'RR' represents homozygous dominant, while 'rr' is homozygous recessive and 'Rr' is heterozygous.

homozygous dominant

• TT

• tt

• Tt

Answer explanation

The term 'homozygous dominant' refers to an organism with two identical dominant alleles. In this case, 'TT' represents homozygous dominant, while 'tt' is homozygous recessive and 'Tt' is heterozygous.

homozygous recessive

• TT

• tt

• Tt

Answer explanation

The term 'homozygous recessive' refers to an organism with two identical recessive alleles. In this case, 'tt' represents homozygous recessive, while 'TT' is homozygous dominant and 'Tt' is heterozygous.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

heterozygous

• TT

• tt

• Tt

Answer explanation

A heterozygous genotype consists of two different alleles for a trait. 'Tt' represents one dominant allele (T) and one recessive allele (t), making it heterozygous. 'TT' and 'tt' are homozygous genotypes.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the genotype for a homozygous recessive trait?

• AA

• aa

• Aa

Answer explanation

The genotype for a homozygous recessive trait is represented by two lowercase letters, indicating that both alleles are recessive. Therefore, the correct answer is 'aa', while 'AA' and 'Aa' represent dominant or heterozygous traits.

Which genotype represents a heterozygous individual?

• BB

• bb

• Bb

Answer explanation

A heterozygous individual has two different alleles for a trait. The genotype 'Bb' represents this, with 'B' being one allele and 'b' being another. In contrast, 'BB' and 'bb' are homozygous genotypes.

Identify the genotype for a homozygous dominant trait.

• CC

• cc

• Cc

Answer explanation

The genotype for a homozygous dominant trait consists of two identical dominant alleles. In this case, 'CC' represents the homozygous dominant genotype, while 'cc' is homozygous recessive and 'Cc' is heterozygous.

What is the genotype for a heterozygous trait?

• XX

• xx

• Xx

Tags

NGSS.HS-LS3-2