Sex-linked Sex-linked InheritanceInheritance

Sex DeterminationSex Determination

Why are some diseases more common in men than women?

Ex. Color blind 8 % of males,8 % of males, but only 0.5% femalesbut only 0.5% females

Sex-Linked Traits Sex-Linked Traits Male and Female Male and Female

Sex-Linked Traits in HumanSex-Linked Traits in Human

Red/Green Red/Green ColorblindnessColorblindness

Hemophilia Hemophilia

HemophiliaHemophilia

Hemophilia Hemophilia

Queen Victoria of England was a carrier

1819-19011819-1901

XBXB Normal Female XBXb Carrier Female (normal) XbXb Disorder female

( you need two copies of the gene in females to express)

XBY Normal male XbY Disorder male

Why do you think sex linked traits effect men more than women?

Would this person Would this person XXHH X Xhh have have hemophilia? Is this male or hemophilia? Is this male or female?female?

Would person Would person XXHHYY have have hemophilia? Is this male or hemophilia? Is this male or female?female?

Sex- Linked Cross 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 CrossSex-Linked Cross

Cross a female that has normal vision with a male that is colorblind. What percent of their children will be colorblind?

XXBBXXOO- only females can show - only females can show both colors- CALICO both colors- CALICO

Problems with Chromosome NumberProblems with Chromosome Number

5.5. Monosomy – only one of a particular type Monosomy – only one of a particular type of chromosome (2n -1)of chromosome (2n -1)

6.6. Trisomy – having three of a particular Trisomy – having three of a particular type of chromosome (2n + 1)type of chromosome (2n + 1)

7.7. Polyploidy – having more than two sets Polyploidy – having more than two sets of chromosomes; triploids (3n = 3 of of chromosomes; triploids (3n = 3 of each type of chromosome), tetraploids each type of chromosome), tetraploids (4n = 4 of each type of chromosome). (4n = 4 of each type of chromosome).