2.4 - Ante- And Postnatal Screening Flashcards
Form of a gene coding for a version of a characteristic.
Allele
Prenatal test to assess health of foetus using cells from amniotic fluid.
Amniocentesis
Antenatal ultrasound scan that checks for physical abnormalities.
Anomaly scan
Use of tests to identify risk of disorder before birth.
Antenatal screening
Allele on chromosomes 1-22; always expressed in phenotype.
Autosomal dominant
Allele on chromosomes 1-22; expressed in phenotype if the genotype is homozygous for the recessive allele.
Autosomal recessive
Prenatal test to assess health of the foetus using cells from the placenta.
Chorionic villus sampling (CVS)
Stage of development up to about 8 weeks that leads to the formation of a foetus.
Embryo
Stage of a baby after 8 weeks of development.
Foetus
Having two different alleles of the same gene.
Heterozygous
Having two identical alleles of the same gene.
Homozygous
When an allele is not completely masked by a dominant allele, thus affecting an individual’s phenotype.
Incomplete dominance
Display of matched chromosomes produced for medical purposes.
Karyotype
Diagram showing the occurrence of phenotypes of a particular gene in a family tree.
Pedigree chart
Metabolic disorder that is tested for by postnatal screening.
Phenylketonuria (PKU)
Diagnostic testing of newborn babies.
Postnatal screening
Identification of the risk of disorders in unborn babies.
Prenatal diagnosis
Testing to show if a person carries rhesus antibodies in their blood.
Rhesus antibody testing
Recessive allele carries on the X chromosome.
Sex-linked recessive
Diagnostic procedure used for various prenatal checks, such as establishing the stage of pregnancy and the date that the baby is due.
Ultrasound scanning
