Congenital night blindness is inherited as a sex-linked recessive.?

If a woman with this disease marries a man who has normal vision, what would be the expected phenotypes of their children with respect to this characeristic?








2. In humans, the condition for normal blood clotting dominates hemophilia. Both genes are sex-linked to the X chromosome. Two parents produced daughters who are all carriers and sons who are all normal. What are the probable genotypes of the parents?





3. A male who has normal blood clotting marries a woman who is a carrier for this condition. What are the chances that if they have a son he will be normal for blood clotting?

Congenital night blindness is inherited as a sex-linked recessive.?
1- I will represent the bad X with X^


woman= X^X^


man= XY





now the punnett





........X ------- Y





X^ XX^ X^Y





X^ XX^ X^Y





1/2 normal girls, but carriers


1/2 blind boys








2- mother: XX


father: X^Y


the father has hemophilia





3- changes for the boy=1/2. example, if they have 2 sons, 1 will have hemo and the other wont have it.





punnett


mother: XX^


father XY








------X-----X^





X ..XX XX^





Y XY X^Y