Genotypes and Phenotypes in Genetics

Which of the following represents a homozygous genotype?A

• Aa

• AA

• Bb

• Bb

Which of the following represents a heterozygous genotype?

• aa

• AA

• Bb

• BB

What is the phenotype of an organism with the genotype 'aa'?

• a) Dominant trait
  

• b) Recessive trait
  

• c) Hybrid trait
  

• 
  d) Cannot be determined

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

What does the term "homozygous" mean?

• a) Two different alleles for a trait
  

• b) Two identical alleles for a trait
  

• c) One dominant allele and one recessive allele
  

• d) A combination of traits from both parents

In the case of the gene for flower color, red (R) is dominant and white (r) is recessive. Which genotype will result in a white flower?

• RR
  

• 1. Rr

• 1. rr
     

• 1. RR

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the genotype for a homozygous dominant individual?

What is the genotype for a heterozygous individual?

In pea plants, the allele for tall (T) is dominant over the allele for short (t). What would be the possible genotypes of offspring from a cross between a homozygous tall plant (TT) and a heterozygous tall plant (Tt)?

An organism with the genotype "aa" is homozygous recessive.

• True

• False

A homozygous recessive genotype can produce a dominant phenotype when crossed with a heterozygous organism.

• True

• False

Tags

NGSS.HS-LS3-1