Monohybrid Crosses and Dominance Types

Who is the father of genetics? 

• Charles Darwin 
• Gregor Mendel
• Dimitri Mendeleev 
• Hans Krebs 

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

An organism with two different alleles for a trait is said to be: 

• recessive
• hybrid
• dominant
• purebred

Recessive alleles are written using

• capital
• lowercase
• both
• neither

Which of the following is a genotype?

• long hair
• blue eyes
• Gg
• tall

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NGSS.HS-LS3-1

Aa is an example of

• homozygous dominant
• homozygous recessive
• heterozygous
• none of these

bb is an example of

• homozygous dominant
• homozygous recessive
• heterozygous
• none of these

Purple is dominant to white. A heterozygous purple flower is crossed with a white flower. What are the genotypes and phenotypes of the offspring?

• 100% Pp (purple)
• 50% Pp (purple); 50% pp (white)
• 75% Pp (purple); 25% pp (white)
• 25% PP, 50% Pp, 25% pp
  75% purple, 25% white

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NGSS.HS-LS3-1

NGSS.HS-LS3-3

Tall is dominant to short. A homozygous tall plant is crossed with a short plant. What will be the phenotypes of the offspring?

• 100% tall
• 50% tall, 50% short
• 75% tall, 25% short
• 25% tall, 75% short

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NGSS.HS-LS3-1

Green is dominant to yellow. Two heterozygous green plants are crossed. What are the genotypes of the offspring?

• 100% Gg
• 50% GG, 50% Gg
• 25% GG, 50% Gg, 25% gg
• 75% Gg, 25% gg

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NGSS.HS-LS3-1

NGSS.HS-LS3-3

A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?

• Incomplete Dominance
• Co dominance
• Independent assortment
• Recessive inheritance