2/12/2015
Genetics Problems
Genetics Problems
(sexlinked traits)
The alien couple pictured above displays characteristics that have been linked to the sex chromosomes of
this particular species. Below is a chart listing some of these traits. Use the information in the chart to
solve the genetics problems that follow.
Dominant
Recessive
Trait
Chromosome
Phenotype
Phenotype
Body color
X
purple
pink
(P)
(p)
Ear shape
X
pointed
round
(H)
(h)
Eye color
X
yellow
red
(E)
(e)
Foot color
X
matches body
mismatch to body
(F)
(f)
Size of nose
X
small
large
(N)
(n)
Eyebrows
Y
eyebrows present
Extra arms
Y
extra arms present for 4 arms total
1. A male with yellow eyes mates with a redeyed female. What is the chance that this couple will have
a baby boy with red eyes? answer
2. A female, heterozygous for the body color trait, mates with a pink male. What is the chance that these
aliens will give birth to a purpleskinned girl? answer
3. A smallnosed male falls in love and marries a largenosed female. The couple becomes pregnant
with their first child. What is the chance that the baby will be a girl and have a large nose like the
mother? answer
4. Two aliens with mismatched feet are expecting a baby. What is the chance that this couple's child
will have feet that match its body? answer
5. Mr. & Mrs. Yardaz are expecting their second child. Both parents have pointed ears but the couple's
2year old son has round ears. What is the chance that their second born will have pointed ears like the
parents? answer
6. Doug Doouge has four arms. Doug's pregnant wife only has two arms. Doug would really like a
daughter that has four arms just like him. What is the chance that Doug's wife will give birth to a baby
1/6