What type of gene is considered recessive and located only on the X chromosome?

A combined Apgar score of __________ indicates that the infant is in good physical condition

A) less than 3 B) 3 or 4 C) 5 or 6 D) 7 or better

In 1950, how many cities had a population greater than ten million, worldwide?

a. one c. 10 b. five d. 20