Questions and Answers
What is the expected phenotype ratio of free to attached earlobes in this study?
How many children are expected to have attached earlobes based on the 3:1 ratio?
What does the chi-square statistic value of 0.375 indicate in this context?
What were the actual numbers of children with free and attached earlobes reported in this study?
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What conclusion can be drawn about earlobe inheritance based on the study's findings?
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Study Notes
Earlobe Inheritance Study
- Investigated if earlobe inheritance aligns with Mendelian genetic rules.
- Surveyed 46 heterozygous parents, totaling 128 children; 99 had free earlobes.
- Free earlobes (F) are dominant over attached earlobes (f).
- Expected phenotype ratio for offspring: 3 free earlobes to 1 attached.
- Based on a 3:1 ratio, expected outcomes for 128 children: 96 free (75%) and 32 attached (25).
- Chi-square statistic calculated to compare observed versus expected values.
- Calculation:
- [ \frac{(99 - 96)^2}{96} + \frac{(29 - 32)^2}{32} = 0.375 ]
- Resulting chi-square value of 0.375 is less than the critical threshold of 3.84.
- Null hypothesis was rejected; supports Mendelian inheritance.
- Observed values closely matched expected values, confirming the inheritance pattern.
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Description
Test your understanding of earlobe inheritance based on Mendelian genetics. This quiz covers concepts of dominant and recessive traits, particularly focusing on free and attached earlobes. Analyze the provided data to answer questions regarding the expected phenotype ratios and outcomes.
