3.2.4 Flashcards
1
Q
karyogram
A
photograph/diagram showing the chromosomes of an organism in homologous pairs of decreasing length
2
Q
karyotype
A
a property of a cell- the no. and type of chromosomes present in the nucleus
3
Q
non-disjunction
A
failure of a pair of homologous chromosomes/sister chromatids to separate
4
Q
trisomy
A
ppl with 3 copies of 1 partic chromosome
5
Q
down syndrome
A
when there’s 3 copies of chromosome 21 present
symptoms: hearing loss, heart and vision problems, intellectual disability
6
Q
important uses of karyogram
A
- deduce sex of individual
- diagnose for chromosomal abnormalities, e.g. Down syndrome
!!also can be used in scientific research and agriculture
7
Q
autoradiography
A
technique that uses x-ray film to visualise the 2D distribution of a radioactively labelled substance
8
Q
autoradiograph
A
image formed through autoradiography
