What is a pedigree chart?
Pedigree Practice

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•
Biology
•
9th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
A pedigree chart is a diagram that shows the occurrence and appearance of phenotypes of a particular gene or organism and its ancestors, used to analyze the inheritance of traits.
2.
FLASHCARD QUESTION
Front
What does it mean if a trait is X-linked recessive?
Back
An X-linked recessive trait is one that is carried on the X chromosome and typically manifests in males, as they have only one X chromosome. Females can be carriers without showing the trait.
3.
FLASHCARD QUESTION
Front
How can you identify a dominant trait in a pedigree?
Back
A dominant trait typically appears in every generation of a pedigree, meaning that at least one parent must have the trait for the offspring to inherit it.
4.
FLASHCARD QUESTION
Front
What does the genotype X^A X^a represent?
Back
The genotype X^A X^a represents a female who is a carrier for an X-linked recessive trait, where X^A is the dominant allele and X^a is the recessive allele.
5.
FLASHCARD QUESTION
Front
How many females in a pedigree can have a recessive trait?
Back
In a pedigree, females can have a recessive trait if they inherit two copies of the recessive allele (one from each parent).
6.
FLASHCARD QUESTION
Front
What is the significance of a skipped generation in a pedigree?
Back
A skipped generation in a pedigree often indicates that the trait is recessive, as it may not appear in every generation.
7.
FLASHCARD QUESTION
Front
What does it mean if a male has the genotype X^a Y?
Back
A male with the genotype X^a Y is affected by an X-linked recessive trait, as he has only one X chromosome carrying the recessive allele.
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