Respuesta :
A feature of a pedigree that indicate that a certain trait is a dominant trait is that one of the parents always have to have the trait.
There are, however, autosomal dominance and X-linked dominance.
For an autosomal dominant trait:
- Appears equally frequent in both sexes.
- Both sexes transmit the trait.
- Present in all generations.
- When one parent has the trait and the other doesn't, approximately half of the offspring will present the trait.
For a X-linked dominant trait:
- Both male and females can present the trait, but more females usually present it.
- Sons with the trait always have a mother that presents the trait as well.
- Daughters with the trait always have either a mother or father that presents the trait, or both.
- Fathers with the trait always have daughters with the same trait.
There are, however, autosomal dominance and X-linked dominance.
For an autosomal dominant trait:
- Appears equally frequent in both sexes.
- Both sexes transmit the trait.
- Present in all generations.
- When one parent has the trait and the other doesn't, approximately half of the offspring will present the trait.
For a X-linked dominant trait:
- Both male and females can present the trait, but more females usually present it.
- Sons with the trait always have a mother that presents the trait as well.
- Daughters with the trait always have either a mother or father that presents the trait, or both.
- Fathers with the trait always have daughters with the same trait.
Answer:
The trait will be shown more frequently in the family pedigree. Rest of the characteristics will depend on whether it is an autosomal or X linked dominant trait.
Explanation:
A pedigree analysis is used to study inheritance of genes in a family. It is used for many purposes like finding out the genetic source of a disorder in family or predicting the trait outcome for future progeny based on status of family members. If it's a dominant trait, it would be expressed even with a single copy so such a pedigree shows the trait more frequently.
Further Explanation:
Autosomal dominant trait:
- An autosomal dominant trait will express itself in both the sexes.
- Both the sexes will pass on the trait.
- Overall pedigree will have at least one affected member in every generation because it is dominant and sex independent.
- If around half of the children are affected and one parent is unaffected that means other parent is affected and heterozygous for the trait .
X-linked dominant trait:
- A X linked dominant trait will be more frequently presented by a female.
- A son with the trait will always have a mother with the trait because he inherited X chromosome from the mother.
- Daughter with the trait will have either one or both the parents affected by the trait.
- Fathers who have this trait will always have daughters with this trait becuase they will pass surely one X chromosome to the daughter.
Learn More:
about pedigree: https://brainly.com/question/2952835 ( answer by JcAlmighty )
about different type of traits: https://brainly.com/question/7135379?section=similar ( answer by Palmss24 )
Keywords: pedigree, autosomal dominant, X-linked dominant, trait
