A defective recessive gene causes the body to produce abnormally thick mucus in lungs.

1.Coughing 2.Short of breath 3.Nausea 4.Increased mucus

This is a recessive trait. You’re only affected if you have a double recessive. Ex. ff  Dad is Ff Mom is Ff  Affected kid is ff 

Down Syndrome is caused by an extra chromosome # 21

1.Flattened facial features 2.Mental retardation 3.Short stature 4.Smaller head

One in every 691 live births is a child with Down syndrome These are pictures of children with Down Syndrome

Hemophillia is caused by a defective gene- results in blood not clotting properly.

1.Frequent breathlessness 2.Shooting abdominal pain 3.Fever 4.paleness

Hemophilia has often been called the "Royal Disease." Queen Victoria of England was a carrier of the hemophilia gene and passed the disease on to several royal families.

Klinefelter Syndrome is caused by an extra “X” chromosome in males

1.Low levels of testosterone 2.Less facial hair 3.Sterile (can’t have children) 4.Wide hips

Normal males have XY sex chromosomes Males with Klinefelter have XXY sex chromosomes