Dominance and Expression of Genes
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Science
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7th Grade
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Medium
Standards-aligned
Randi Kelleher
Used 40+ times
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9 Slides • 10 Questions
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Dominance and Expression of Genes
Unit 4 Notes
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Poll
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Polygenetic Inheritance
In some cases, there could be more than two alleles for the same trait, an example of this is rabbit's fur which could be four possible colors.
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Polygenetic Inheritance
This is when a trait can be controlled by two or more genes, examples of this includehair and skin tone.
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Incomplete Dominance
Sometimes we experience what is called incomplete dominance. This is when neither allele from either parent is completely dominant. The phenotype of the offspring is a heterozygous mix of the parents.
An example: Red Snapdragon and White Snapdragon produce a Pink snapdragon
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Codominance
The other type of trait that we can see is called codominance. This is when both genes appear equally on the offspring.
Example: A black chicken and a white chicken produce a speckled chicken.
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Multiple Choice
A highly spotted wild cat and a non-spotted wild cat produced this offspring with some spots:
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Multiple Choice
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Multiple Choice
A woman with curly hair and a man with straight hair produced a child with wavy hair:
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Multiple Choice
A man with blue eyes and a woman with brown eyes produced a child with brown eyes:
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Multiple Choice
A pink flower and a white flower produced this offspring:
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Multiple Choice
A pink flower and a white flower produced this offspring:
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Multiple Choice
A long-haired female rabbit and a short-haired male rabbit produced this offspring with a medium-length coat:
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Multiple Choice
A black male and white female produced this grey offspring:
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Multiple Choice
A brown rooster and a white chicken produced this speckled offspring:
Dominance and Expression of Genes
Unit 4 Notes
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