4. You have been studying a trait that seems to be present in every generation within a particular family. Further, you have observed that every affected offspring has at wor least affected parent in any particular generation. bas berswoll wollsy nog wohl di lozin a) This trait is more likely due to a dominant or recessive allele? to vas of otsige smesno vns el role b) Interestingly, this allele is completely penetrant in the homozygous state while only 75% penetrant in the heterozygous condition. If two heterozygous individuals who carry this allele are mated, what is the expected proportion of affected progeny?

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**Understanding Genetic Inheritance Patterns**

**4. Genetic Study of Trait Inheritance**

You have been studying a trait that seems to be present in every generation within a particular family. Further, you have observed that every affected offspring has at least one affected parent in any particular generation.

a) Is this trait more likely due to a dominant or recessive allele?

b) Interestingly, this allele is completely penetrant in the homozygous state while only 75% penetrant in the heterozygous condition. If two heterozygous individuals who carry this allele are mated, what is the expected proportion of affected progeny?

---

**Explanation:**

- **Dominant vs. Recessive Alleles:**
  - The trait appears in every generation, which suggests a dominant allele pattern.

- **Penetrance:**
  - The allele shows complete penetrance in homozygous individuals and partial penetrance (75%) in heterozygous individuals.

- **Progeny Analysis:**
  - When two heterozygous individuals mate, the expected proportion of affected progeny needs to be calculated considering the penetrance levels.

This pattern can be represented using a Punnett square, which helps in understanding the expected genetic outcome when two carriers mate.

---
Transcribed Image Text:--- **Understanding Genetic Inheritance Patterns** **4. Genetic Study of Trait Inheritance** You have been studying a trait that seems to be present in every generation within a particular family. Further, you have observed that every affected offspring has at least one affected parent in any particular generation. a) Is this trait more likely due to a dominant or recessive allele? b) Interestingly, this allele is completely penetrant in the homozygous state while only 75% penetrant in the heterozygous condition. If two heterozygous individuals who carry this allele are mated, what is the expected proportion of affected progeny? --- **Explanation:** - **Dominant vs. Recessive Alleles:** - The trait appears in every generation, which suggests a dominant allele pattern. - **Penetrance:** - The allele shows complete penetrance in homozygous individuals and partial penetrance (75%) in heterozygous individuals. - **Progeny Analysis:** - When two heterozygous individuals mate, the expected proportion of affected progeny needs to be calculated considering the penetrance levels. This pattern can be represented using a Punnett square, which helps in understanding the expected genetic outcome when two carriers mate. ---
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