Incomplete and Codominance
Flashcard
•
Science
•
12th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is codominance in genetics?
Back
Codominance is a form of inheritance where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive. An example is a roan cow, which has both red and white fur.
2.
FLASHCARD QUESTION
Front
What is the phenotypic ratio expected from a cross between two roan cows?
Back
The expected phenotypic ratio is 1:2:1, which means 1 red, 2 roan, and 1 white.
3.
FLASHCARD QUESTION
Front
Define incomplete dominance in genetics.
Back
Incomplete dominance is a form of inheritance where the phenotype of a heterozygote is intermediate between the phenotypes of the two homozygotes. For example, in snapdragons, red (RR) and white (rr) flowers produce pink (Rr) flowers.
4.
FLASHCARD QUESTION
Front
What is the probability of two pink snapdragons producing pink offspring?
Back
The probability is 50%.
5.
FLASHCARD QUESTION
Front
What are the phenotypes produced when crossing a red flower (RR) with a speckled flower (RB)?
Back
The phenotypes produced are 2 red flowers and 2 speckled flowers.
6.
FLASHCARD QUESTION
Front
What is the phenotypic ratio when crossing two speckled flowers (RB)?
Back
The phenotypic ratio is 1 red, 2 speckled, and 1 blue.
7.
FLASHCARD QUESTION
Front
How does codominance differ from incomplete dominance?
Back
In codominance, both alleles are fully expressed in the phenotype, while in incomplete dominance, the phenotype is a blend of the two alleles.
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