Screening Flashcards
Between which weeks does a dating scan take place?
8-14 weeks
Between which weeks does an anomaly scan take place?
18-20 weeks
Name the scan that may detect serious physical abnormalities with the fetus?
Anomaly scan
Name 2 types of tests carried out throughout pregnancy to monitor concentrations of marker chemicals.
a) urine tests
b) blood tests
Name two types of diagnostic testing.
a) Chorionic villus sampling
b) amniocentesis
What is an advantage of CVS over amniocentesis?
It can be done earlier in pregnancy
What is the advantage of amniocentesis over CVS?
Lower risk of miscarriage
What name is given to an individual’s chromosomes arranged as homologous pairs?
Karyotype
Give 3 examples of disorders that can be detected by looking at the karyotype.
1) Down’s syndrome
2) Turner’s syndrome
3) Klinefelter’s syndrome
What do we call different forms of a gene?
allele
What do we call the alleles an organism has for a particular characteristic, usually written as letters e.g. Bb or BB
Genotype
What do we call the visible characteristics of an organism which occur as a result of its genes?
Phenotype
What term is used to describe an allele that always expresses itself whether it is partnered by a recessive allele or by another like itself?
Dominant
What term is used to describe the variant of a gene for a particular characteristic which is masked or suppressed in the presence of the dominant variant?
Recessive
What term is used to describe a genotype where the 2 alleles are identical?
Homozygous
