Ch 21: Online 3 Flashcards
Human Development and Genetics
The appearance of an individual with respect to a genetic trait
Phenotype
The embryonic stage with an inner cell mass in a hollow sphere
Blastocyst
The embryonic membrane that forms the first blood cells
Yolk sac
Having two different genes for a trait
Heterozygous
Carries blood with oxygen from the placenta to the fetus
Umbilical vein
A trait that will be expressed only if two genes are present for it
Recessive
The opening between the fetal atria of the heart
Foramen ovale
The genetic material of chromosomes is ___ acid
Deoxyribonucleic acid
A fetal test that involves cells withdrawn from amniotic fluid
Amniocentesis
For humans, chromosome pairs 1 through 22
Autosomes
Hemophilia is an example of this pattern of inheritance
Sex-linked trait
The primary germ layer from which the nervous system develops
Ecoderm
The genes present in an individual with respect to a genetic trait
Genotype
Embedding of the blastocyst within the endometrium
Implantation
Matching maternal and paternal chromosomes
Homologous pair
The rubella virus and alcohol are examples
Teratogen
The part of the sperm that contains enzymes to digest the ovum membrane
Acrosome
A trait that will be expressed even if only one gene for it is present
Dominant
A synonym for “birth”
Parturition
The 40 weeks of pregnancy
Gestation
Secretes hCG during early pregnancy
Chorion
A physical assessment of a newborn in the first few minutes after birth
Apgar score
The embryonic membrane that forms a fluid-filled sac
Amnion
Having more than five digits per hand or foot
Polydactyly
Having two similar genes for a trait
Homozygous
