Presentation on theme: "Sex-linked Inheritance. Sex Determination Why are some diseases more common in men than women? Ex. Color blind 8 % of males, 8 % of males,"— Presentation transcript:
Why are some diseases more common in men than women? Ex. Color blind 8 % of males, 8 % of males, but only 0.5% females but only 0.5% females
Sex-Linked Traits Male and Female
Sex-Linked Traits in Human Red/Green Colorblindness Hemophilia
Hemophilia Queen Victoria of England was a carrier 1819-1901
X B X B Normal Female X B X b Carrier Female (normal) X b X b Disorder female ( you need two copies of the gene in females to express) X B Y Normal male X b Y Disorder male Why do you think sex linked traits effect men more than women?
Would this person X H X h have hemophilia? Is this male or female? Would person X H Y have hemophilia? Is this male or female?
Sex- Linked Cross If a mother who is a carrier for Hemophilia has a child with a father who has normal blood. What percent of the children will have Hemophilia? What percent of the boys?
Sex-Linked Cross Cross a female that has normal vision with a male that is colorblind. What percent of their children will be colorblind?
X B X O - only females can show both colors- CALICO
Problems with Chromosome Number 5. Monosomy – only one of a particular type of chromosome (2n -1) 6. Trisomy – having three of a particular type of chromosome (2n + 1) 7. Polyploidy – having more than two sets of chromosomes; triploids (3n = 3 of each type of chromosome), tetraploids (4n = 4 of each type of chromosome).