11.3 Study Guide Flashcards
(8 cards)
If the parent genotypes are x^Bx^b and x^bY, what is the phenotype ratio for the offspring?
1/4 Carrier female : 1/4 colorblind female : 1/4 colorblind male : 1/4 Full color vision male.
What is the definition of Autosomal Dominant?
The dominant trait is not in a sex chromosome and the trait is dominant not recessive.
What is the definition of sex-linked?
It means the gene/trait is in a sex gene (either X-linked or Y-linked).
How can a sex-linked trait skip a generation?
It can be recessive and not be in the males and be hidden in the females.
What is a pedigree?
The family line/tree created for following certain genetics.
If a trait doesn’t skip a generation, does that mean it’s recessive?
No, though it doesn’t rule it out. But it can also be dominant.
If a trait is in an X sex gene, which parent is it from?
Both parents or either one if it’s a female, the mom only when it’s a male.
Can Y-linked traits skip generations?
No, because males always pass down the Y gene to males, and if they don’t have boys then the line is stopped, not skipped.
