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HHB 2.4 2025
glossary
19
Biology
Not Applicable
10/05/2025

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Term
antenatal screening
Definition
done to identify risk of a disorder in foetus
Term
ultrasound imaging
Definition
technique used in dating scan and anomaly scan
Term
dating scan
Definition
determines stage of pregnancy and due date – done between 8-14 weeks of pregnancy
Term
anomaly scan
Definition
can detect serious physical abnormalities in the foetus – done between 18-20 weeks of pregnancy
Term
blood and urine
Definition
samples routinely taken from pregnant women to monitor the concentrations of marker chemicals.
Term
amniocentesis
Definition
diagnostic test to determine if the foetus has a medical condition – performed later in pregnancy and has lower risk of miscarriage
Term
chorionic villus sampling (CVS)
Definition
diagnostic test to determine if the foetus has a medical condition – performed earlier in pregnancy and has higher risk of miscarriage
Term
karyotype
Definition
image of chromosomes from the cells sampled by amniocentesis and CVS
Term
autosome
Definition
any of the 22 pairs of non-sex chromosome
Term
carrier
Definition
individual who is not affected by a genetic condition but can pass it on to their offspring
Term
autosomal recessive
Definition
pattern of inheritance caused by recessive allele on autosome
Term
autosomal dominant
Definition
pattern of inheritance caused by dominant allele on autosome
Term
incomplete dominance
Definition
pattern of inheritance caused by two alleles on autosome that are neither fully recessive or fully dominant to the other allele
Term
sex-linked recessive
Definition
pattern of inheritance caused by recessive allele on part of X chromosome where there is no corresponding Y chromosome
Term
post-natal screening
Definition
diagnostic testing done after baby is born
Term
substitution mutation
Definition
type of mutation that causes PKU
Term
PKU
Definition
condition that results from non-functional enzyme for breakdown of phenylalanine to tyrosine
Term
phenylalanine
Definition
dietary amino acid that is not broken down in PKU
Term
restricted diet
Definition
treatment for someone with phenylketonuria (PKU)
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