Multiple Choice
Down syndrome is a genetic disorder that results from
A) the presence of an extra 21st chromosome.
B) an autosomal recessive gene.
C) a sex-linked dominant gene.
D) a specific combination of three recessive genes.
E) the presence of three sex chromosomes usually XXY.
Correct Answer:
Verified
Correct Answer:
Verified
Q77: The allantois develops into the fetal portion
Q78: Which of the following is NOT an
Q79: X and Y chromosomes are sex chromosomes.
Q80: While all the organ systems are present
Q81: Successful fertilization is most likely to occur
Q83: Which of the developmental stages shown in
Q84: The series of rapid mitotic cell divisions
Q85: Which of the following structures serves as
Q86: Use the Punnett square of inheritance of
Q87: The principal stimulus for prolactin secretion during