PLS HELP ASAP!!!The pedigree diagram shows how a dominant trait is inherited in a family. The red circle and squares show family members with the trait.
Based on the pedigree diagram, who must be heterogeneous for the trait?
A. The child without the trait
B. Both parents
C.The child with the trait
D. Only one parent
Answers
Answer 1
Answer:To determine who must be heterozygous for the trait based on the given pedigree diagram, we need to look for patterns of inheritance and consider the possible genotypes of the individuals.
If the trait is dominant, individuals who exhibit the trait can either be homozygous dominant (TT) or heterozygous (Tt). Homozygous dominant individuals would have both parents with the trait, while heterozygous individuals would have one parent with the trait.
From the pedigree diagram, we can observe that the child without the trait does not have any parent with the trait. This means that the child without the trait must have two recessive alleles (tt) and is therefore homozygous recessive, not heterozygous.
Both parents in the pedigree diagram have the trait, indicating that they are both either homozygous dominant (TT) or heterozygous (Tt). Therefore, it is possible for one or both parents to be heterozygous for the trait.
Based on this information, the correct answer is:
D. Only one parent
Explanation:
Answer 2
Answer:
B. Both Parents
Explanation:
If the trait is dominant, a person who is homozygous dominant or heterozygous for the trait will express the trait. In the pedigree given, we see that both affected individuals (the red circle and squares) have at least one affected parent. This suggests that the trait is likely inherited from both parents, which means both parents must be heterozygous (i.e., carry one dominant and one recessive allele for the trait).
The child without the trait is homozygous recessive, meaning they inherited two copies of the recessive allele from both parents who are both heterozygous for the trait. Therefore, the correct answer to the question is B, "Both parents."
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