Pedigree Chart: Speckled Bunny Syndrome printable pdf download

Name __________________________ Partner _______________________ Date ___________

FA#7: Pedigree Chart: Speckled Bunny Syndrome

Background: The female sex chromosomes are XX and the male sex chromosomes are XY. Speckled

bunny syndrome is a sex-linked condition that causes the fur of a rabbit to have spots. This condition is

most likely to exist in a male bunny because the recessive gene is located on the X chromosome of the

female, so if a male receives that gene he will have speckled bunny syndrome since there is no speckled

bunny gene on the Y chromosome. A female bunny, represented in this activity as the honey bunnies, is a

carrier for speckled bunny syndrome because she has one of the recessive genes for speckled bunny

syndrome. In order for a female bunny to have speckled bunny syndrome she would have two receive the

recessive gene on both X chromosomes. [Hint: X

X = carrier female, X

= speckled bunny syndrome

female, and X

Y = speckled bunny syndrome male. The

is the speckled bunny syndrome recessive gene.]

Materials: bag of 15 bunnies (3-chocolate chip, 7-chocolate, 5-honey)

Task: Using the background information and your knowledge of genetics, you must create a pedigree

chart that shows how speckled bunny syndrome is passed through a population of bunnies. Your pedigree

chart must:

 have a title

 have a key to explain the symbols (male, female, carrier female, affected male, bunnies that

mated)

 have 3 generations using all of the bunnies

 correctly number all of the bunnies in the chart

 have the correct number of bunnies who are carriers and that have speckled bunny syndrome

Hint: Keep in mind that in order for a male bunny to have speckled bunny syndrome he must have a

mother who is a carrier for speckled bunny syndrome. The chocolate bunnies can be males or females,

but the chocolate chip bunnies are only __________ and the honey bunnies are only ___________.

Remember this when you are constructing your pedigree chart:

X = carrier female

Y = speckled bunny syndrome male

The

is the speckled bunny syndrome recessive gene.

Created by J. Warrick 2011

Pedigree Chart: Speckled Bunny Syndrome