An expectant father asks the nurse, Which part of the mature ...

[tsand2]

An expectant father asks the nurse, Which part of the mature sperm contains the male chromosomes? What is the best response by the nurse?
 
  a. X-bearing sperm
  b. The tail of the sperm
  c. The head of the sperm
  d. The middle portion of the sperm

Question 2

Two healthy parents who carry the same abnormal autosomal recessive gene have what percentage chance of having a child affected with the disorder caused by this gene? Record your answer as a whole number. _____
 
  Fill in the blank with correct word.

[catron30]

Answer to Question 1

ANS: C
The head of the sperm contains the male chromosomes that will join the chromosomes of the ovum. If an X-bearing sperm fertilizes the ovum, the baby will be female. The tail of the sperm helps propel the sperm toward the ovum. The middle portion of the sperm supplies energy for the tail's whiplike action.

Answer to Question 2

ANS:
25
Two healthy parents who carry the same abnormal autosomal recessive gene have a 25
chance of having a child affected with the disorder caused by this gene. Unaffected
parents are carriers of the abnormal autosomal recessive trait. Children of carriers have a
25 (1 in 4) chance of receiving both copies of the defective gene and thus having the
disorder.