Prenatal Flashcards
(133 cards)
– also known as conception, is the process by which sperm and ovum (sex cells) combine to create a single cell called zygote, which then duplicates itself again and again by cell division.
o Fertilization
– rupture of mature follicle in either ovary and expulsion of its ovum which occurs every month until menopause
o Ovulation
also known as Fraternal Twins
o Dizygotic Twins
– resulted from the cleaving of one fertilized egg and are generally genetically identical
o Monozygotic Twins
genetic transmission of heritable characteristics from parents to offspring
o Heredity
– long, spiraling ladder whose steps are made of pairs of chemical units called bases
o Deoxyribonucleic Acid
coils of DNA of smaller segments called genes
o Chromosomes
cell division of non-sex cells
o Mitosis
cell division of sex cells
o Meiosis
mistake in copying genetic code which creates permanent alteration in genetic material
o Mutation
not affiliated to sexual expression
o Autosomes
23rd pair which indicates the baby’s sex (XX, female: XY, male)
o Sex Chromosomes
produce alternative expressions of characteristics
o Alleles
if two alleles are the same
o Homozygous
if two alleles are different
o Heterozygous
– allele that is always expressed or shows up as a trait in that person
o Dominant
– usually doesn’t show unless paired with another recessive trait
o Recessive
– interaction of several genes
o Polygenetic Inheritance
observable characteristics
o Phenotype
underlying genetic makeup
o Genotype
environment can influence when and which genes turn on and off
o Epigenesis
Extra copy of chromosome 21
Down Syndrome
Extra X Chromosome (XXY)
Klinefelter Syndrome
Abnormality in X chromosome causes ID
Fragile X Syndrome