100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Summary Gr 12 Life Sciences Record & Final 2024 Paper 2 $6.66
Add to cart

Summary

Summary Gr 12 Life Sciences Record & Final 2024 Paper 2

 16 views  0 purchase
  • Course
  • Institution

Gr 12 Life Sciences 2024 Paper 2 SACAI SEP 2019 – 2021 & NOV 2019 – 2021, NSS DBE/ November 2023, EC/SEPTEMBER 2023.. TOPICS Multiple questions 1. DNA p. 8 2. GENETICS AND INHERITANCE p. 19 3. MEIOSIS p. 37 4. EVOLUTION THROUGH NATURAL SELECTION p. 36 - 53 & HUMAN EVOLUTION

Preview 4 out of 53  pages

  • July 27, 2024
  • 53
  • 2023/2024
  • Summary
  • 200
avatar-seller
1




Previous exam papers were used to compile these notes. SACAI SEP 2019 – 2021 & NOV
2019 – 2021, NSS DBE/ November 2023, EC/SEPTEMBER 2023.. These are just suggested
answers from the memorandums. Some information is repeated, I want to show you the
different ways the same information is asked for.
I encourage you to answer the computation/illustration questions without even looking
at the answers.

Good luck. Juffrou Ansie
TOPICS

Multiple questions
1. DNA p. 8
2. GENETICS AND INHERITANCE p. 19
3. MEIOSIS p. 37
4. EVOLUTION THROUGH NATURAL SELECTION p. 36 - 53
& HUMAN EVOLUTION




@Juffrou_Ansie

, 2


Multiple questions

“Out of Africa” hypothesis All humans originated from a common ancestor in Africa.
Mitochondrial DNA evidence showed that an African
woman was the ancestor of all humans.
Gradualism Model for evolution suggested by Darwin that suggests that
speciation is slow and uniform.
DNA from fossils CANNOT be used as evidence for evolution
DNA-profiling/DNA fingerprinting The procedure used by forensic pathologists to identify
criminals based on the unique sequence of nucleotides on
their DNA.
Africa The continent that is currently accepted as the cradle of
humankind.
Lamarckism Acquired characteristics are inheritable.
RNA RNA is short single stranded. RNA differs from DNA in that it
has uracil and a ribose sugar.
Advantages of bipedalism • A person can see further to spot predators.
• It frees a person’s arms to carry things.
• It enables a person to cool down quicker.
Biotechnology/ Bio-engineering The use of biological organisms or biological processes to
make products that can improve human lives
Homologous structures Structures in different organisms that share similarities but
have different functions.
3:1 ‘A black furred rabbit is crossed with a white furred rabbit. All
their offspring (F1) is black. If two of their offspring is
crossbred, their offspring’s (F2) phenotypic ratio will be 3:1
BB x WW A black mouse was crossbred with a white mouse. All their
offspring is grey. The P1 genotype = BB x WW
Homo naledi These hominins are considered the most modern
Aneuploidy Down syndrome
XY Chromosomes of a boy
Gregor Mendel’s laws Law of independent assortment


@Juffrou_Ansie

, 3


The diagram illustrates part of a DNA molecule.
A single DNA nucleotide is shown by sub-unit(s): X, Y and Z
together.




Type of inheritance is illustrated by the diagram below: Co-
dominance




Unstriped body with normal The alleles for striped body and normal antennae are
antennae dominant over the alleles for unstriped body and abnormal
antennae. The phenotype of the fly numbered 4 will be
unstriped body with normal antennae.
The diagram illustrates a genetically engineered bacterial
cell. The structure labelled X is a plasmid.




Interphase The phase of the cell cycle during which DNA replication
takes place.
The process of DNA replication 1. The (DNA) double helix unwinds and – unzips
DBE/November 202 /hydrogen bonds break to form two separate strands
2. Both (DNA) strands serve as templates to build a
complementary (DNA) strand/ A pairs with T and C
pairs with G using free (DNA) nucleotides from the
nucleoplasm
3. This results is two identical (DNA) molecules
Locus The specific position of each gene on a chromosome.
Ribosome The site of protein synthesis.
Chiasmata Points on a chromosome where crossing over takes place
Haploid A single set of chromosomes in a cell.
Anti-codons The triplet of three consecutive bases on t-RNA.


@Juffrou_Ansie

, 4


Monohybrid A genetic cross where only one hereditary characteristic is
investigated at a time.
Homozygous An individual that has two of the same alleles of a gene/
Having two identical genes at the same locus.
Punctuated equilibrium Evolution occurs in sudden bursts after long periods of no
change.
Alleles determine characteristics such as petal colour in
flowers. An allele is an alternative form of a gene.



Goltz Syndrome Goltz Syndrome is a condition in humans that adversely
affects the skin. It is inherited as a dominant gene carried on
the X chromosome.
Layer 4 of the rock in the diagram below is most likely to
contain the oldest fossils



Statements is correct:
The domestic dog is closer related to the African wild dog
than to the jackal.




Biogeography The study of the distribution of species.
Foramen magnum The opening in the skull through which the spinal cord leaves
the brain.
Dr Lee Berger The South African palaeontologist who discovered
Australopithecus sediba.
Outbreeding Reproduction between unrelated members of a population.
Quadrupedalism The mode of walking permanently on four legs.




@Juffrou_Ansie

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

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

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 ansiestudynotes. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $6.66. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

53068 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$6.66
  • (0)
Add to cart
Added