What must occur for a recessive trait to be expressed in a child? ...

[cabate]

What must occur for a recessive trait to be expressed in a child?
 
  a. Both parents must carry the recessive trait.
  b. One parent must carry the recessive trait.
  c. Neither parent can carry the recessive trait.
  d. A sibling must carry the recessive trait.

Question 2

During a prenatal class, a participant asks when the most critical period of fetal development occurs. Which of the following is the most appropriate response?
 
  a. The embryonic period, from the second to eighth week after conception.
  b. Immediately following implantation.
  c. During the zygotic phase after fertilization.
  d. From twenty to thirty weeks of gestation, when the organs are formed.

[abro1885]

Answer to Question 1

ANS: A
Each parent must carry a recessive trait for there to be a chance of the offspring to display the trait.

Answer to Question 2

ANS: A
The embryonic period of development is when the basic organ structures are formed. During this time, teratogenic agents have the most damaging effects on the developing embryo.

[cabate]

TYSM

[ttt030911]

Gracias!