Genotypic and Phenotypic Ratios

Black hair color is dominant to white hair color in mice.  Determine the phenotypic ratio for the offpring of a heterozygous black mouse and a white mouse.

• 4 Black: 0 White
• 3 Black: 1 White
• 2 Black: 2 White
• 0 Black: 4 White

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

When a man has an allele combination Ww for a trait, what percentage of his gametes will have a dominant allele for that trait?

• 25%
• 50%
• 75%
• 100%

In certain species of plants, purple flowers (P) are dominant to white flowers (p). If two heterozygous plants are crossed, what will be the phenotype of the offspring?

• 100% purple flowers
• 100% white flowers
• 75% white flowers, 25% purple flowers
• 25% white flowers, 75% purple flowers

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

An allele that is masked when a dominant allele is present. The "weaker" gene. 

• Dominant Allele
• Recessive Allele

An allele whose trait always shows up in the organism when the allele is present. The "stronger" gene. 

• Dominant Allele
• Recessive Allele

An organism’s genetic makeup or allele combination.

• Genotype
• Phenotype
• Beanotype
• Notype

Tags

NGSS.HS-LS1-1

An organism’s physical appearance, or visible traits. 

• Genotype
• Phenotype
• Beanotype
• Notype

What is called when a organism has  two different alleles for a trait. Tt or Rr

• Heterozygous
• Homozygous
• Domozygous
• Thermozygous

What is called when a organism has two identical alleles for a trait. TT or tt. RR or rr

• Heterozygous
• Homozygous
• Domozygous
• Thermozygous

In pea plants, tall stems (T) are dominant over short stems (t). If a homozygous tall plant is crossed with a heterozygous tall plant, what is the expected phenotypic ratio of the offspring?

• 100% tall

• 75% tall, 25% short

• 50% tall, 50% short

• 25% tall, 75% short

Tags

NGSS.HS-LS3-1