unattached earlobes are dominant to attached earlobes. cleft chin is dominant to no cleft. parents that are heterozygous for both traits are crossed.

determine the ratio of offspring with the described trait to the total number of offspring:
unattached earlobes and cleft chin: /
unattached earlobes and no cleft: /
attached earlobes and cleft chin: /
attached earlobes and no cleft: /

Question

unattached earlobes are dominant to attached earlobes. cleft chin is dominant to no cleft. parents that are heterozygous for both traits are crossed.

determine the ratio of offspring with the described trait to the total number of offspring:
unattached earlobes and cleft chin:   /
unattached earlobes and no cleft:   /
attached earlobes and cleft chin:   /
attached earlobes and no cleft:   /

Accepted Answer

{ "quality": "clear", "question_count": 1, "skills_matched": [ "step_cot", "blank_filling_formatter", "explain_then_answer", "tutor", "mastery_adaptive_brevity" ], "needs_drawing": false, "concepts_used": [ "Dihybrid Cross", "Punnett Square" ], "new_concepts": [], "current_concepts": [ "Dihybrid Cross", "Punnett Square", "Mendelian Genetics" ] } ## Define alleles and parental genotypes Using the *Dihybrid Cross* knowledge point $$ \begin{aligned} &\text{E: Unattached earlobes (dominant), e: Attached earlobes (recessive)}\ &\text{A: Cleft chin (dominant), a: No cleft chin (recessive)}\ &\text{Parental Genotypes: } EeAa \times EeAa \end{aligned} $$ ## Determine phenotypic ratios of the dihybrid cross Using the *Punnett Square* knowledge point $$ \begin{aligned} &\text{Unattached, Cleft (E\_A\_): } \frac{9}{16}\ &\text{Unattached, No cleft (E\_aa): } \frac{3}{16}\ &\text{Attached, Cleft (eeA\_): } \frac{3}{16}\ &\text{Attached, No cleft (eeaa): } \frac{1}{16} \end{aligned} $$ Determine the ratio of offspring with the described trait to the total number of offspring: Unattached earlobes and cleft chin: 9 / 16 Unattached earlobes and no cleft: 3 / 16 Attached earlobes and cleft chin: 3 / 16 Attached earlobes and no cleft: 1 / 16 { "subject": "Natural Science", "question_type": "Fill-in-the-blank", "knowledge_point": [ "Natural Science", "Biology", "Mendelian Genetics" ] }

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QUESTION IMAGE

Question

Explanation:

Define alleles and parental genotypes

Determine phenotypic ratios of the dihybrid cross

Answer: