2.3 review Genetic disorders

Question 1

Where do congenital anomalies result from

Answer 1

genetic errors, which often produce disruptions in protein synthesis

Question 2

When do sex linked disorders result from

Answer 2

Can result when a recessive trait on the x chromosome of a male is not matched to an alleles on the smaller Y chromosome.

Question 3

What are the common dominant-recessive sex-linked disorders?

Answer 3

• Male pattern baldness,
• hemophilia
  -color blindness

Question 4

Chromosomal breakage can occur. For example, fragile X syndrome is caused by a gene replication error affecting the tips of the

Answer 4

X chromosome

Question 5

Chromosomal anomalies can also affect th other 22 pairs of autosomes. List one example of this

Answer 5

Down syndrome

Question 6

In chromosomal anomalies that involve gene imprinting, the phenotype expressed depends on

Answer 6

which parent the gene comes from

Question 7

Some DNA is contained in the cells’ mitochondria. What happens when this DNA deficient?

Answer 7

Genetic mitchondrial disorders may result.
-mMales may have these disorder but it can’t be passed down to the offspring

Question 8

What is genetic counseling?

Answer 8

This helps prospective parents to determine the risks of having a baby affected by genetic anomalies and to make appropriate decisions based on these risks.