QQuestionBiology
QuestionBiology
"Which is an example of incomplete dominance?
A. A red flower and a yellow flower mating to produce a yellow flower.
B. A red flower and a yellow flower mating to produce an orange flower.
C. Two orange flowers mating to produce an orange flower.
D. A red flower and a yellow flower mating to produce a red flower."
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Answer
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Step 1:Let's solve this step by step:
Step 2:: Understanding Incomplete Dominance
Incomplete dominance (also called partial dominance) occurs when two different alleles combine to produce a phenotype that is a blend or intermediate of the two parent traits. In this case, neither allele is completely dominant over the other.
Step 3:: Analyzing the Genetic Scenario
In a typical incomplete dominance scenario, when two different alleles are present, the resulting offspring will show a phenotype that is a mixture of the two parental traits.
Step 4:: Examining the Options
A. A red flower and a yellow flower mating to produce a yellow flower - This is NOT incomplete dominance. This would suggest complete dominance of the yellow allele. B. A red flower and a yellow flower mating to produce an orange flower - THIS IS an example of incomplete dominance. The red and yellow alleles blend to create an intermediate orange color. C. Two orange flowers mating to produce an orange flower - This is consistent with the offspring of incomplete dominance, but it's not the best example of the initial mixing of traits. D. A red flower and a yellow flower mating to produce a red flower - This describes complete dominance, not incomplete dominance.
Step 5:: Reasoning
When a red-flowered plant ($$R_1$$) and a yellow-flowered plant ($$R_2$$) mate, their offspring will have an intermediate color (orange), representing a blend of the two parental traits.
In incomplete dominance, neither allele is completely dominant.
Final Answer
A red flower and a yellow flower mating to produce an orange flower is the correct example of incomplete dominance.
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