Prenatal Development

Question 1

unique way a cell duplicates

Answer 1

mitosis

Question 2

meiosis

Answer 2

chromosomes pair up and exchange segments, so genes from one pair are replaced by genes from another

Question 3

what determines gender?

Answer 3

father’s sperm

Question 4

dizygotic

Answer 4

2 eggs are fertilized by 2 different sperm at the same pregnancy

Question 5

zygote begins to separate and becomes two clusters of cells that are identical

Answer 5

monozygotic

Question 6

different forms of the same gene

Answer 6

alleles

Question 7

genotype

Answer 7

underlying combination of genes

Question 8

observable trait

Answer 8

phenotype

Question 9

down syndrome

Answer 9

failure of the 21st chromosome to separate during meiosis; person has three of these chromosomes

Question 10

how long does prenatal take?

Answer 10

38 weeks

Question 11

implantation

Answer 11

between 7-9 days old

blastocyst borrows into uterine lining

Question 12

one vein that brings nutrients in and two arteries that take waste out

Answer 12

umbilical cord

Question 13

ectoderm

Answer 13

outer layer of skin and its appendages

Question 14

connective tissue- muscle, bone, musoskeletal, and circulatory system

Answer 14

mesoderm

Question 15

innermost of primary germ layers

Answer 15

endoderm

Question 16

ectoderm fold over to from primitive spinal cord, then 3.5 weeks swells to form the brain

Answer 16

neural tube

Question 17

9 weeks-birth

Answer 17

fetal period

Question 18

vernix

Answer 18

white, cheesy substance that protects baby’s skin from irritation of amnionic fluid

Question 19

infertility

Answer 19

inability to conceive within 18-24 months of trying

Question 20

teratogens

Answer 20

any substance that can alter development during gestation period