Non-Mendelian Inheritance Worksheet
Explore the complexities of genetics beyond simple Mendelian patterns with this worksheet covering incomplete dominance, codominance, and multiple alleles.
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Non-Mendelian Inheritance
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Read each question carefully and provide your best answer. Show all work for Punnett squares and genetic crosses.
1. In snapdragons, flower color is inherited via incomplete dominance. A cross between a red-flowered plant (RR) and a white-flowered plant (WW) produces pink-flowered offspring (RW). What phenotypic ratio would you expect from a cross between two pink-flowered plants?
3 Red : 1 White
1 Red : 2 Pink : 1 White
1 Red : 1 Pink : 1 White
All Pink
2. Which of the following describes codominance?
One allele completely masks the other.
The heterozygous phenotype is an intermediate blend.
Both alleles are expressed equally and distinctly in the heterozygote.
Multiple genes contribute to a single trait.
3. Human blood types are an example of alleles, where there are more than two possible alleles for a given gene.
4. When neither allele is completely dominant over the other, resulting in a blended phenotype in heterozygotes, this is called dominance.
5. A roan cow, having both red and white hairs, demonstrates inheritance.
6. Explain the difference between incomplete dominance and codominance, providing an example for each.
7. In humans, blood type is determined by multiple alleles: I^A, I^B, and i. I^A and I^B are codominant, and i is recessive to both. A man with type AB blood (I^A I^B) and a woman with type O blood (ii) have children. Complete the Punnett square and answer the questions below.
a. What are the possible genotypes of their offspring?
b. What are the possible phenotypes of their offspring?
c. What is the probability of having a child with type A blood?
8. Polygenic inheritance is a type of Non-Mendelian inheritance where multiple genes contribute to a single trait.
True
False
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