Week 1- Sex-related genes Flashcards
What is the only exception to the matched pairs of chromosomes?
The pair that determine gender
Two different types of chromosomes
X & Y - look different and carry different genes
Male vs female chromosome combos
Two Xs for females; X & Y for males
Sex-linked traits are
Traits influenced by genes on sex chromosome
What chromosome controls almost all sex-linked traits?
X chromosome because Y is small and carries few genes other than those determining male sex development
Why do dominant traits occur more often in females than males?
Because they have twice the chance of inheriting the dominant gene
Traits controlled by genes on the X chromosome occur in one sex more often than the other
That’s all, just know that. (yes, I got lazy with this one)
Why do recessive sex-linked traits occur more in males?
Because, if they inherit the trait on X, there is nothing to over-ride it on Y and they express the trait, whereas, in females, they will express it only if they inherit to recessive genes
What is the example of a recessive sex-linked trait given in class?
Color blindness, which is rare in women
