1. Alleles that are neither dominant nor recessive to one another, so both alleles are always expressed in the phenotype. Codominant 2. The inheritance of a single gene Monohybrid inheri- tance 3. Physical, behavioural, biochemical expression of an organisms genotype Phenotype 4....
1 alleles that are neither dominant nor recessive to one another
so both alleles are always expressed in the phenotype codominant 2 the inheritance of a single gene monohybrid inheri tance
Written for
AQA A-Level Biology Paper 2
AQA A-Level Biology Paper 2
AQA A-Level Biology Paper 2
All documents for this subject (34)
Seller
Follow
YOURVERIFIEDEXAMPLUG
Reviews received
Content preview
AQA A-Level Biology Paper 2
Study online at
https://quizlet.com/_cv2okl
1. Alleles that are neither dominant nor recessive to
Codominant
one another, so both alleles are always
expressed in the phenotype.
2. The inheritance of a single gene Monohybrid
inheri- tance
3. Physical, behavioural, biochemical expression Phenotype
of an organisms genotype
4. The type of genes an individual has Genotype
5. Alles that is always expressed in the phenotype Dominant
6. Only expressed in the phenotype when Recessive
homozy- gous
7. both alleles are the same Homozygous
8. Both alleles for a specific gene are different Heterozygous
9. Position of a gene on a chromosome Loci
10. A set of instructions for a specific polypeptide Gene
11. Different forms of a gene Allele
12. 1. Expected ratios are probability Suggest one
2. Sexual reproduction is random due to random reason why
fusion of gametes and random assortment observed ratios
homol- ogous chromosomes. are not the same
as expected
13. 1. Homologous chromosomes pair up ratios (1).
2. Crossing over / chiasmata form;
3. Produces new combination of alleles Meiosis results in
4. Chromosomes separate at random cells that have
5. This produces varying combinations of genes the haploid
6. Chromatids separated at meiosis II number of
chromosomes
and show genetic
1/
, AQA A-Level Biology Paper 2
Study online at
varia- https://quizlet.com/_cv2okl
tion. Explain how. (6)
14.
2/
, AQA A-Level Biology Paper 2
Study online at
https://quizlet.com/_cv2okl
1. Refer to the specific individuals (using Pedigree
their number) Questions Mark
2. Explain what happened with the genes (passed Scheme (3)
on recessive/dominant)
3. Describe the genotype of your examples and
mention their phenotype
(homozygous/heterozy- gous etc)
15. Group of organisms of the same species occupy-
ing a particular space at a particular time that can Populations
potentially interbreed to produce fertile offspring.
16. The total number of genes of every individual in
an interbreeding population. Gene pool
17. How often an allele appears in a population.
Allele
desired allele/total alleles = allele frequency
(deci- mal form)
frequency
18. No emigration or immigration
No mutations
Mating is random
No natural selection
Hardy-
19. 1. Selection pressure exists in an
Weingberg
environment (name it)
Assumptions
2. Variation exists in stated phenotype of
(4)
organ- ism/ mutation occurs
3. Some individuals have the selective
advantage (describe it)
4. Produces differential survival/ organisms
Natural selection
with successful alleles more likely to survive
MS (7)
5. Natural selection occurs
6. Survivors breed and pass on alleles to
offspring
7. Over time, there is a switch in allele frequency
20. Favours the mean phenotype. (Normal
distribution becomes narrower)
3/
, AQA A-Level Biology Paper 2
Study online at
https://quizlet.com/_cv2okl
Stabilising selection
4/
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller YOURVERIFIEDEXAMPLUG. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.99. You're not tied to anything after your purchase.
