Ch 21: Online 3

Question 1

The appearance of an individual with respect to a genetic trait

Answer 1

Phenotype

Question 2

The embryonic stage with an inner cell mass in a hollow sphere

Answer 2

Blastocyst

Question 3

The embryonic membrane that forms the first blood cells

Answer 3

Yolk sac

Question 4

Having two different genes for a trait

Answer 4

Heterozygous

Question 5

Carries blood with oxygen from the placenta to the fetus

Answer 5

Umbilical vein

Question 6

A trait that will be expressed only if two genes are present for it

Answer 6

Recessive

Question 7

The opening between the fetal atria of the heart

Answer 7

Foramen ovale

Question 8

The genetic material of chromosomes is ___ acid

Answer 8

Deoxyribonucleic acid

Question 9

A fetal test that involves cells withdrawn from amniotic fluid

Answer 9

Amniocentesis

Question 10

For humans, chromosome pairs 1 through 22

Answer 10

Autosomes

Question 11

Hemophilia is an example of this pattern of inheritance

Answer 11

Sex-linked trait

Question 12

The primary germ layer from which the nervous system develops

Answer 12

Ecoderm

Question 13

The genes present in an individual with respect to a genetic trait

Answer 13

Genotype

Question 14

Embedding of the blastocyst within the endometrium

Answer 14

Implantation

Question 15

Matching maternal and paternal chromosomes

Answer 15

Homologous pair

Question 16

The rubella virus and alcohol are examples

Answer 16

Teratogen

Question 17

The part of the sperm that contains enzymes to digest the ovum membrane

Answer 17

Acrosome

Question 18

A trait that will be expressed even if only one gene for it is present

Answer 18

Dominant

Question 19

A synonym for “birth”

Answer 19

Parturition

Question 20

The 40 weeks of pregnancy

Answer 20

Gestation

Question 21

Secretes hCG during early pregnancy

Answer 21

Chorion

Question 22

A physical assessment of a newborn in the first few minutes after birth

Answer 22

Apgar score

Question 23

The embryonic membrane that forms a fluid-filled sac

Answer 23

Amnion

Question 24

Having more than five digits per hand or foot

Answer 24

Polydactyly

Question 25

Having two similar genes for a trait

Answer 25

Homozygous