Pedigree Biology

True or false?

Individual II-2 is male.

• True

• False

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

True or false?

Individual II-2 is the son of individual I-1 and I-2.

• True

• False

Tags

NGSS.HS-LS3-1

The ability to roll your tongue into a tube is

an inherited characteristic in humans. In the

pedigree below, the shaded individuals can

roll their tongues. Work out if tongue-rolling

is dominant or recessive.

• Dominant

• Recessive

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The pedigree shows an example of a x-linked recessive trait. Which statement about it is incorrect?

• Only males are affected.

• None of the females are affected.

• Some females are carriers.

• 100% of the sons of a carrier mother will have the condition.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

On a pedigree, this symbol represents a ---

• not affected female.

• not affected male.

• affected male.

• affected female.

Who are the parents of person lll-4? Click on the two individuals within this pedigree chart.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In this pedigree chart, Huntington's Disease is the genetic disorder that is being traced throughout this family's bloodline. Click on the females that are expressing this trait in this family tree.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In this pedigree, (a)   can be carriers of colorblindness and not have it.

• Just males

• Just females

• Both genders

Answer explanation

Only females can be carriers of colorblindness and not have it, as they inherit the trait on the X chromosome and can have one normal X chromosome to compensate.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

On a pedigree chart, females are represented by...

and males are represented by...

a

b

male

female

Match the following shapes to what they would represent on a pedigree chart.

• female that does NOT express the trait.

• 
• male that DOES express the trait.

• 
• female that DOES express the trait.

• 
• male that does NOT express the trait.

•