Sex linked pedigree

Sex linked pedigree

By Mia Scardina

Determining type of trait

Dominant

- Does not skip generations​

- Each affected individual must have at least 1 affected parent.

- Skips generations​

- Offspring can have the disorder even if their parents are both unaffected.

- arents are heterozygous. ​

​Recessive

Multiple Choice

What is the genotype of person I-1?

• AA

• Aa

• aa

Multiple Choice

What type of trait is Huntington's disease?

• Dominant
• Recessive

Multiple Choice

What is the genotype of person II-4?

• AA

• Aa

• aa

Determining type of trait

Autosomal

• On regular chromosome

• ​Affects males and females equally.

• Gene is located on sex chromosome ​( X or Y )

• Affects males more

  • Males only have ​1 X (so the trait does not need to be dominant to show)

  • Only males have a Y chromosome

​Sex linked (recessive)

Multiple Choice

What type of trait is shown in this pedigree?

• dominant

• recessive

Examples of Sex linked Recessive traits

Hemophilia

​Color blindness

​Male pattern baldness

Multiple Choice

What type of heredity is shown in the pedigree?

• Sex-Linked Recessive
• Autosomal Dominant
• Autosomal Recessive 

Multiple Choice

The pedigree above is an example of:

• Autosomal dominant

• Autosomal recessive

• Sex linked recessive

Multiple Choice

What type of trait does this pedigree show?

• Autosomal Dominant

• Autosomal Recessive

• Sex linked Recessive

Multiple Choice

What type of trait does this pedigree show?

• Autosomal dominant

• Autosomal recessive

• sex linked recessive

Multiple Choice

What is the mode of inheritance shown here?

• Sex Linked Recessive
• Autosomal Dominant
• Autosomal Recessive

Multiple Choice

What type of heredity is shown in the pedigree?

• Autosomal Dominant

• Autosomal Recessive

• Sex linked Recessive

Multiple Choice

Why do all girls of a male who has the dominant X-linked trait also have the trait?

• because they get both X’s from their Dad.

• because the dad gives them the Y.

• because they get one X from their mom which always has the dominant trait.

• because they get one X from their dad which has the dominant trait.

Sex linked Punnett Square

Multiple Choice

Hemophilia is a recessive sex-linked trait. If H = normal & h = has hemophilia, which genotype represents a male with hemophilia. 

• X^HY
• X^HX^h
• X^hX^h
• X^hY 

Multiple Select

Assuming a trait is X-LINKED RECESSIVE, what are the genotypes of an UNAFFECTED person? (select all that apply)

• X^AY

• X^aY

• X^AX^A

• X^AX^a

• X^aX^a

Multiple Choice

What would the genotype be of a colorblind male?

• X^NY

• X^NYⁿ

• XⁿY

• XⁿYⁿ

Multiple Choice

Hemophilia is a recessive x-linked disorder.
Which genotype represents a female who is a carrier for hemophilia?

• X^HX^h
• X^hX^h
• X^HX^H
• X^hY