10 Questions
What is the probability of having a baby girl, according to Mendelian genetics, for a couple who already has three sons?
50%
In humans, which sex chromosomes are possessed by females and males respectively?
XX in females and XY in males
Why are X-linked traits and disorders more commonly expressed in males than in females?
Males have only one copy of the X chromosome
What is hemophilia characterized by?
Inability of the blood to clot properly
Which chromosome carries more genes, making it more commonly linked to genetic mutations and disorders?
X chromosome
Why does a male manifest a sex-linked disorder if he inherits a certain allele?
Due to not having a second X chromosome to provide a protective dominant allele
Why can females be carriers of a sex-linked disorder without showing symptoms?
Because they possess a second X chromosome with a normal allele
What causes color-blindness, particularly red-green color blindness?
Deficiency in red or green cones in the retina
In terms of inheritance, what genotype represents a normal female carrier of hemophilia?
XHXh
Why do men have a higher chance of being color-blind compared to women?
Inheritance of the Xb allele on the single X chromosome
Learn about the genetic cross between a male (XY) and a female (XX) and how it determines the sex of offspring. Understand the equal probability of having a male or female offspring and the 50% chance of forming XX or XY chromosomes during fertilization.
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