B1- OCR 21st century

?
  • Created by: kxtieb__
  • Created on: 11-06-16 13:52
where do genes occur?
DNA
1 of 40
DNA molecules consist of two strands called__?
double helix
2 of 40
what is the term describing the genetic makeup of an organism?
genotype
3 of 40
the differences between individuals of the same species are described as?
variation
4 of 40
name the allele that controls the development of characteristics
dominant
5 of 40
name the allele that controls the development of characteristics when the other allele is not present
recessive
6 of 40
a dominant allele is denoted by what?
capital
7 of 40
what is it called when 2 alleles are the same?
homozygous
8 of 40
what is it called when 2 alleles are different?
heterozygous
9 of 40
how many pairs of chromosomes are there?
23
10 of 40
Huntington's disease is caused by what?
single faulty allele
11 of 40
the undifferentiated gonads start producing a hormone called what?
androgen
12 of 40
cystic fibrosis is caused by the presence of how many alleles?
2 recessive alleles
13 of 40
Huntington's disease effects where?
central nervous system
14 of 40
when do symptoms of Huntington's disease normally develop?
adulthood
15 of 40
why will everyone who inherits the allele develop Huntington's disease?
dominant allele
16 of 40
what does cystic fibrosis affect?
cell membrane
17 of 40
is there a cure for cystic fibrosis?
no
18 of 40
if an individual is a carrier why wont they develop cystic fibrosis?
recessive allele
19 of 40
risk of genetic testing?
death of embryo
20 of 40
what fluid is extracted in amniocentesis testing?
amniotic
21 of 40
what is removed in chronic villus genetic test?
chronic villi
22 of 40
what type of reproduction does not involved sex?
asexual reproduction
23 of 40
plants such as strawberries produce shoots called____?
runners
24 of 40
type of unspecialized stem cell that can develop into many but not all cells?
adult
25 of 40
type of unspecialized stem cell which can turn into all cells?
embryonic
26 of 40
another name for a microorganism
pathogen
27 of 40
what is the first physical barrier ?
skin
28 of 40
what type of enzyme engulfs pathogens?
neurophil
29 of 40
what type of enzyme produces antibodies?
B cell
30 of 40
what are B- Cells also called?
memory cells
31 of 40
whats the name for something which is used to describe chemicals that inhibit the growth of microorganisms
antimicrobials
32 of 40
antibiotics are chemicals which are only effective against what?
bacteria
33 of 40
why can bacteria become resistant to antimicrobial's?
mutations
34 of 40
a trail where both patient and doctor know they are using a new treatment
open
35 of 40
a dummy drug is called a ____?
placebo
36 of 40
what is a ethical reason against dummy drugs?
false hope
37 of 40
a trail where only the doctor knows they are testing a new drug
blind
38 of 40
a trial where neither patient or doctor knows they are testing a new drug
double-blind
39 of 40
when looking at the possibilities of inheriting a allele we use what?
punnet square diagram
40 of 40

Other cards in this set

Card 2

Front

DNA molecules consist of two strands called__?

Back

double helix

Card 3

Front

what is the term describing the genetic makeup of an organism?

Back

Preview of the front of card 3

Card 4

Front

the differences between individuals of the same species are described as?

Back

Preview of the front of card 4

Card 5

Front

name the allele that controls the development of characteristics

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all B1 resources »