From the above patterns of inheritance, which of the following are exemplary for non-Mendelian inheritance?
A. $2,3,4$
B. $1,2,4$
C. $1,3,4$
D. $1,2,3$
Answer (2)
Identify non-Mendelian inheritance patterns.
Analyze each example: inflated pod (Mendelian), roan calf (non-Mendelian), AB blood type (non-Mendelian), pink rose (non-Mendelian).
Determine that examples 2, 3, and 4 are non-Mendelian.
The answer is: A
Explanation
Understand the problem We are given four examples of genetic inheritance patterns and asked to identify which are examples of non-Mendelian inheritance.
Define Mendelian vs. Non-Mendelian Inheritance Mendelian inheritance involves dominant and recessive alleles. Non-Mendelian inheritance includes patterns like incomplete dominance, codominance, etc.
Analyze each example
Inflated pod form is dominant: This is Mendelian inheritance.
Roan calf from red cow and white bull: This is codominance (non-Mendelian).
AB blood type from AA and BB parents: This is codominance (non-Mendelian).
Pink rose from red and white roses: This is incomplete dominance (non-Mendelian).
Determine the answer Based on the analysis, examples 2, 3, and 4 are non-Mendelian inheritance. Therefore, the correct answer is A. 2 , 3 , 4 .
Examples
Understanding non-Mendelian inheritance is crucial in fields like medicine and agriculture. For instance, predicting the likelihood of a child inheriting a specific blood type (like AB from parents with AA and BB) is vital for blood transfusions and genetic counseling. Similarly, in agriculture, understanding how flower color is inherited can help breeders create new varieties with desired traits. These inheritance patterns demonstrate that genes don't always follow simple dominant/recessive rules, leading to a wider range of possible outcomes. In the case of the roan calf, neither the red nor white allele is dominant, resulting in a mixed coat color. This is different from Mendelian inheritance where one trait would completely mask the other.
The correct answer identifying examples of non-Mendelian inheritance is A. 2 , 3 , 4 , which includes the roan calf, AB blood type, and pink rose, as they do not follow simple dominant/recessive rules. The other example, inflated pod, is Mendelian. Non-Mendelian patterns include codominance and incomplete dominance.
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