Biology/Genealogy of Development

Question 1

Down’s Syndrome

Answer 1

A form of severe intellectual disability that results from an extra 21st chromosome.

Question 2

Phenylketonuria (PKU)

Answer 2

Genetic defect in which the child lacks the enzyme needed to digest phenylalanine; can be controlled with a strict diet.

Question 3

Klinefelter’s Syndrome

Answer 3

Found in males with an extra X chromosome.

Question 4

Turner’s Syndrome

Answer 4

Found in females with only one X chromosome.

Question 5

Zygote

Answer 5

Cell formed when sperm cell fertilizes the egg

Question 6

Germinal Period

Answer 6

The fertilized egg travels down the fallopian tube and is implanted into uterine wall.

Question 7

Embryonic Period

Answer 7

Eight weeks after germinal period; embryo increases in size by 2 million percent.

Question 8

Fetal Period

Answer 8

Begins in the 3rd month, measurable electric activity in fetus’ brain.

Question 9

Rooting (neonatal reflex)

Answer 9

Infants automatically turning their heads in the direction of stimuli.

Question 10

Moro (neonatal reflex)

Answer 10

Infants reacting to abrupt movements; flinging out arms, extending fingers, hugging themselves.

Question 11

Babinski (neonatal reflex)

Answer 11

Infants’ toes automatically spreading when the soles of their feet are stimulated.

Question 12

Grasping (neonatal reflex)

Answer 12

Infants automatically close their fingers around objects in their hand.