Transcript Sex-Linked Blood types Problems

Sex-Linked and Blood Types Challenge!
MCP BIOLOGY 2012-2013
QUESTION 1
Hemophilia
is a X-linked
recessive disease. What would
be the genotype for a normal
female and male?
ANSWER 1
Female:
Male:
H
H
X X
H
X Y
QUESTION 2
Hemophilia
is a X-linked
recessive disease. Write a key
for the five possible genotypes
and phenotypes.
ANSWER 2
H
H
X X
– Normal female
H
h
X X – Carrier female
h
h
X X – Hemophiliac female
H
X Y – Normal male
h
X Y – Hemophiliac male
QUESTION 3
Why
does the Y allele
not have a superscript?
(little letter next to the Y)
ANSWER 3
Because
the Y
chromosome contains
much less genetic
information
QUESTION 4
Why
must men always
inherit a X-linked trait
from their mother?
ANSWER 4
Because
to a be a male they
always must receive father’s Y
chromosome and can only
receive an X chromosome from
their mother
QUESTION 5
What
percent of offspring would
have hemophilia if a women
who was a carrier had children
with a normal man.
(Support your answer with a punnett
square)
ANSWER 5
25%
H
X
h
X
H
X Y
h
XY
H
H
h
H
H
X XX XX
Y
QUESTION 6
In
Drosophila (fruit flies) red eyes
are X-linked and dominate to white
eyes. What percent of offspring
would have red eyes if a
homozygous dominate female
mated with a white eyed male?
ANSWER 6
100%
R
X
R
X
R
XY
R
XY
r
R
r
R
r
X XX XX
Y
QUESTION 7
A
form of Muscular Dystrophy
(loss of muscle tissue)is a Xlinked recessive disease. What
percent of offspring would have
the disease if a carrier female
mated with a man who had the
disease.
ANSWER 7
50%
M
X
m
X
M
X Y
m
X Y
m
m
m
M
m
X X X X X
Y
QUESTION 8
Red-green
color blindness is a
X-linked recessive trait. What
would be the genotype of the
parents if they had a 50%
chance of normal sons and 50%
chance of carrier daughters?
(Must draw punnett square)
ANSWER 8
 Dad - XbY
 Mom - XBXB
b
B
b
B
b
X XX XX
Y
B
XY
B
XY
QUESTION 9
 Vinny,
a colorblind person got married,
divorced, and remarried. He and his first
wife, Ryder, has a colorblind son, a
colorblind daughter, a normal son and a
normal daughter.
 He and his current wife, Snooki, have
four boys and two girls, none of whom
are colorblind.
(Make a punnett square for Vinny and each wife)
ANSWER 9
Vinny
x Ryder
C
c
X X
C
c
c
c
c
X
X
XX
X
Y
C
XY
c
XY
Vinny
x Snooki
QUESTION 10
 Hairy
ears is inherited as a Y-linked
recessive trait. A man with hairy ears
marries a woman with normal
ears. Draw a Punnett square of the
possible offspring. Could any of their
children have hairy ears?
ANSWER 10
50%
X
h
Y
X
X
XX
XX
h
XY
h
XY
MAURY MAURY MAURY!!!
When it comes to 4 year old Chris,
You are ________________ the FATHER!!!
QUESTION 11
Ayanie with blood type IAIB marries Roderige
with blood type O or ii. They child has blood
type O or ii. Is this man the child’s father?
QUESTION 12
A
woman with blood type A or IAi marries a
man with blood type B or IBi. They child
has blood type O or ii. Is this man the
child’s father?
QUESTION 13
A
child with blood type AB or IAIA is born to
a mother with blood type B or IBIB and
father with blood type IAi. Is this man the
father?