Bio Lesson 3-9

What are sex-linked

traits?

video

sex-linked traits

traits that are controlled by
the sex chromosomes

pedigree

03

a chart that shows inheritance of
certain traits over several
generations

carrier

02

Describe the topic of the section here

Objective: Describe how certain traits are
inherited along with sex chromosomes.

01

inherited traits

● sex chromosomes carry genes

● some traits are inherited along with the

gender

● the traits that are controlled by X and Y

chromosomes= sex linked traits

● most sex-linked traits found on X

chromosome

Multiple Choice

Sex chromosomes carry genes-true or false

• true

• false

Sex-linked Disorders

● hemophilia- blood does

not clot

● colorblindness- can’t see

difference between
certain colors

sex-linked disorders cont.

● Sex-linked disorders usually found in men

● Genes for most sex-linked disorders are

recessive

● Women have two XXs

○ one x may have disorder

○ the other may not

■ the female will be normal

Carriers

● Women with 1 normal

gene & 1 gene with
sex-linked disorder =
carrier

○ they don’t show

disorder

○ they pass to

children

dad

mom

Multiple Choice

If a female has an x^r she will...

• have the disorder

• be healthy

• be a carrier

Multiple Choice

If a male has an x^r he will...

• have the disorder

• be healthy

• be a carrier

Carriers cont.

● During meiosis, sex chromosomes separate

○ if you have a female carrier=

■ ½ the eggs gets normal chromosome

■ ½ the eggs get chromosome with

disorder

hemophilia

● don’t have protein for blood to clot

● is a recessive trait

● females usually carriers

● males usually get the disease

● Queen Victoria of England

pedigrees

● predicting traits

● similar to a family tree

● shows a trait over generations

● shows carriers and those who have the

disease

pedigrees cont.

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