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A-Level Biology Year 1 - OCR B notes > Chapter 10 - Evolution and Classification > Flashcards

Chapter 10 - Evolution and Classification Flashcards

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1
Q

Definition of species

A

A group of organisms which can reproduce to produce fertile offspring.
Have common genetic, biochemical, physiological, an atomic features.

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2
Q

Definition of classification

A

The process of sorting organisms into groups based on similarities and differences.

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3
Q

Why do scientists classify organisms?

A
  • to identify species
  • to predict characteristics
  • to find evolutionary links
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4
Q

What is the biological species concept?

A

Defines species as a group with similar morphological, physiological, behavioral, biochemical and ecological features.
Can interbreed with each other to produce fertile offspring.

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5
Q

What is the phylogenetic species concept?

A

Defines a species as the smallest group that shares a common ancestor.

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6
Q

What is the hierarchy of classification?

A 
Domain 
Kingdom 
Phylum 
Class
Order
Family 
Genus 
Species
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7
Q

What is binomial nomenclature?

A
  • the naming system used for classification
  • first part of the name is the genus
  • second part of the name is the species
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8
Q

Advantages of the international binomial name

A
  • avoids confusion between countries

- avoids ambiguity

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9
Q

Types of adaptations

A 
1 . Anatomical 
- physical structure 
2 . Behavioral 
- simple reflex response 
3. Physiological 
- biochemical or cellular characteristics
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10
Q

Anatomical adaptations in humans

A
  1. Bipedalism
    - walking on 2 feet
    - allows for tool use
    - greater ability to hunt
  2. Brain size
    - tripled over the course of human evolution
    - more complex info can be processed.
    - greater ability to adapt to changing environment
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11
Q

Behavioral adaptations in humans

A
  1. Tool use
    - improved hunting
    - ability to obtain high protein and high energy diet
  2. Social adaptations
    - behavior helps maintain larger social groups.
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12
Q

Physiological adaptations in humans

A
  1. Lactose tolerance
    - source of calcium
  2. Skin pigmentation
    - loss of body hair
    - provides protection from dangerous UV radiation
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13
Q

Adaptations to temperature in plants

A
  • low growing (minimize risk of freezing.)
  • dark in color (help absorb radiation)
  • disk shaped flowers (focus heat from the sun)
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14
Q

Adaptations to water in plants

A
  • close stomata when water is limited
  • close stomata at the hottest points of the day
  • spread long roots over wide area
  • hairs on epidermis
  • thick waxy cuticle
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15
Q

Adaptations to light in plants

A
  • air spaces in tissues
  • seeds and stems contain air spaces
  • leaves and stems are flexible
  • plants in deeper waters have specialized photosynthetic pigments to absorb specific wavelengths of light.
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16
Q

Adaptations to mineral concentration in plants

A
  • obtain nitrogen from animals they trap and digest
17
Q

Genetic causes for variation

A
  1. Mutations
    - changes to DNA sequences
  2. Alleles
    - different forms of genes
  3. Meiosis
    - random assortment of chromosomes and chromatids in metaphase 1 and 2
    - crossing over
  4. Sexual reproduction
    - selection of mates is random
    - fertilization is random
18
Q

Environmental causes for variation

A

Biotic and abortion factors

E.g. light availability, nitrates available

19
Q

What is a selection pressure?

A

An environmental factor that drives evolution in a particular direction.

20
Q

Process of natural selection

A
  1. Variation is present within the original population.
  2. New allele arrives due to mutation
  3. Selective advantage have increased chances of survival
  4. Less advantaged will die of or fail to reproduce
  5. Overtime population will have the selective advantage
21
Q

What is allopatric speciation?

A

Caused by geographical isolation.

Different population experience different selection pressures.

22
Q

What is sympatric speciation?

A

Caused by reproductive isolation.

Unable to reproduce successfully with each other.

23
Q

Evidence for evolution

A
  1. Palaentology
    - study of fossils and fossil records.
  2. Comparative anatomy
    - study of similarities and differences in anatomy
  3. Comparative biochemistry
    - similarities and differences between the chemical makeup of organisms
  4. Archeological artifacts
  5. Computer similarities
24
Q

Evolution of Hominids

A
  • increased brain size
  • increased leg length
  • bipedalism
  • enlarged heels
  • upright body position
25
Q

4 methods to study the evolution of language

A
  1. genetics
  2. comparisons with other species
  3. fossils
  4. computer simulations
26
Q

2 language evolution theories

A
  1. gossip / grooming theory

2. mother tongue theory

27
Q

what is the gossip / grooming theory

A
  • suggests vocal grooming replaced physical grooming

- maintain social bonds between social groups

28
Q

what is the mother tongue theory

A
  • words and basic language evolved for communication between mothers and offspring
29
Q

what is biodiversity?

A

a variety of organisms living in a defined area

30
Q

what is ecosystem biodiversity?

A

measures the number of and range of different ecosystems

31
Q

what is species diversity?

A

measure of number of different species in abundance of each species in defined area

32
Q

what is species richness?

A

number of different species that exist within a defined area

33
Q

what is species evenness?

A

measure of relative abundance of each species in a defined area

34
Q

what is genetic diversity?

A

the measure of variety of alleles within a species

35
Q

3 methods of measuring genetic diversity

A
  1. number of alleles per gene
  2. heterozygosity
  3. proportion polymorphic genes
36
Q

how to calculate the proportion of polymorphic gene loci?

A

= number of polymorphic gene loci / total number of loci

A-Level Biology Year 1 - OCR B notes (15 decks)

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