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Biology B1 > Variation > Flashcards

Variation Flashcards

(49 cards)

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1
Q

What is classification

A

Organising living organisms into groups

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2
Q

What are the five kingdoms

A 
Animalia
Plantae 
Fungi
Protoctist
Prokaryote
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3
Q

Describe the animal kingdom

A

They are heterotrophic so can’t make their own food and have to move about and find things to eat
They are multicellular so have more than one type of cell
They have no cell walls or chlorophyll

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4
Q

What is an allele

A

Different versions of the same gene

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5
Q

What is heterozygous

A

Two different alleles for a gene

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6
Q

What is homozygous

A

When the two alleles are the same for a gene

Can be recessive or dominant

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7
Q

What is phenotype

A

The characteristic you have e.g. Blue eyes

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8
Q

What is genotype

A

The genes or alleles that you have e.g. Hh

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9
Q

Describe the plant kingdom

A

They are multicellular so contain more than one type of cell
They’re autotrophic so can make their own food by photosynthesis
They have rigid cell walls and chlorophyll

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10
Q

Describe the fungi kingdom

A

They are saprophytes so feed off dead organisms and decaying material
They’re multicellular so contain more than one type of cell
They have a cell wall but no chlorophyll

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11
Q

Describe the protoctist kingdom

A

They are uni cellular so have one type of cell

They have a nucleus

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12
Q

Describe the prokaryote kingdom

A

They’re unicellular

They have no nucleus

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13
Q

What is used to classify organisms

A 
Kingdom
Phylum
Class
Order
Family
Genus 
Species
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14
Q

What is the phylum Chordata

A

It’s made up of animals that all have a supporting rod structure up the back of their body e.g. A back bone

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15
Q

What are the different ways vertebrates absorb oxygen

A

Lungs eg birds
Gills eg fish
Skin eg amphibians

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16
Q

What are the different watch vertebrates can reproduce

A

Internal fertilisation eg mammals
External fertilisation eg fish
Oviparous eg reptiles they lay eggs
Viviparous eg mammals they give birth to live young

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17
Q

What are the different ways vertebrates can regulate their body temp

A

Homeothermic means they’re warm blooded and can regulate their own body temp eg mammals
Poikilothermic means their temperature changes with the external environment eg reptiles

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18
Q

Why isn’t accurate classification always easy

A

Newly discovered species don’t always fit into any of the categories or fit into more than one
Some species reproduce asexually not interbreed like the definition
You can get hybrids that can be fertile
There’s lots of variation between species eg breeds of dog
You can get ring speices

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19
Q

What is a species

A

Organisms in the same species can interbreed to produce fertile offspring

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20
Q

What is a ring species

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A

A group of related populations that live in neighbouring areas the populations that live next to each other can produce fertile offspring but populations that live further apart can’t so it’s hard to tell if the populations are in the same species

21
Q

What is the binomial system

Study These Flashcards
A

Each species has a two part Latin name
The first part is the genus
The second part is the species
Eg Homo sapiens

22
Q

How is the binomial system useful

Study These Flashcards
A

Helps identify species where common names mean different things
Helps us study species because people can share information on them
It helps us conserve species because two similar looking species could appear to be in the same species so only one of the speices is protected
Helps us target conservation efforts because we can protect areas with lots of variety of species

23
Q

What is a key

Study These Flashcards
A

It’s a series of questions used to find out what an unknown organism is

24
Q

What is variation within species

Study These Flashcards
A

When organisms in the same species look different

It’s caused by genes and the environment

25
What is genetic variation
An organisms characteristics are inherited from its parents Some genes are from the mother and some from the father The two sets of genes combining causes variation Also mutations in genes can cause genetic variation Some variations are caused only by genes e.g. Eye colour and inherited disorders
26
What is environmental variation
The place where organisms live and grow causes differences between members of the same species Eg. Plant in the dark will be yellow but the same pant in the light will be much bigger and green The factors that can cause environmental variation are diet, exercise, temperature, light levels, amount of water etc
27
What characteristics are caused by the genes and the environment
Body weight skin colour etc | Eg the maximum height you can grow to is genetic but the height you actually grow to is environmental
28
What is continuous variation
When the individuals in a population vary within a range There are no distinct categories Eg mass It causes a natural distribution or bell curve
29
What is discontinuous variation
When there are two or more different categories and the individual only falls into one of them there are no intermediates Eg blood group
30
How can you show continuous variation
Record a group of peoples hand span and you will be able to draw a graph showing the natural distribution curve
31
How can you show discontinuous variation
Record the eye colour of a group of people and each person will fit into a distinct category
32
How are organisms adapted to living in the deep sea
There is little food Some can emit light from parts of their bodies eg the angler fish has a light rod sticking out of its head that attracts prey which the angler fish eats They usually have huge mouths so they can move along the sea bed scraping up food They can have huge eyes adapted to the dark or feelers on their body so they can feel where they're going
33
How are creatures adapted to living in volcanic vents in the sea bed
The chemicals support the bacteria so they can make their own food using chemical energy (chemosynthesis) which is like photosynthesis but uses chemical energy instead of light energy The bacteria are at the bottom of the food chain and animals feed on them They are adapted to cope with the high heat and pressure
34
How is the deep sea Pompeii worm adapted
It has a thick layer of bacteria to protect it from the heat It can go inside a papery tube to protect it from predators
35
How are polar bears adapted
They have a compact shape giving them a small surface area to reduce heat loss They have a thick layer off blubber for insulation and an energy store if there's little food Thick hairy coats trap a layer of warm air near the skin Greasy fur shears water preventing cooling by evaporation Big feet spread their weight so they don't sink into the snow White fur for camouflage
36
How are penguins adapted
They have a thick layer of fat for insulation and energy store They have oily feathers to shed water Huddle together in groups to conserve heat Streamlined body to reduce water resistance so they can swim faster to catch more fish
37
What is natural selection
There's variation within species Most organisms have more young than can survive to adulthood There completion for resources The individuals with adaptations that mean it's easier to get the resources are more likely to survive and breed successfully So the responsible gene is more likely to get passed on to the next generation The ones that are less well adapted are less likely to survive so will eventually die out Over time the better adapted characteristic becomes more common and the bad adaptation dies out
38
What is evolution
The slow and continuous change of organisms from one generation to the next
39
How does DNA research support evolution
The theory suggests that all organisms come from one common ancestor Closely related species separated more recently Evolution is caused by gradual changes in DNA So organisms that separated more recently should have more similar DNA e.g. Humans and chimps have similar DNA
40
How do resistant organisms support evolution
The poison warfarin is used to kill rats But a certain gene gives resistance to warfarin so these rats are more likely to survive and breed So now there are are rat populations that are warfarin resistant
41
How does the scientific community validate evidence
Scientific journals are where scientists can publish their findings so other scientists can repeat the experiments Peer review is when scientists get other scientists to review their work Scientific conferences where scientists attest to discuss their findings
42
What is speciation
When populations of the same species become so different they can no longer produce fertile offspring
43
What is stage one of speciation
Isolation When the populations are separated usually by a physical barrier Eg earthquake or flood can cause barriers that geographically isolate some individuals from the population
44
What is stage two of speciation
Conditions on either side of the barrier will be slightly different e.g. They may have different climates so natural selection occurs
45
What is stage three of speciation
Eventually the individuals from each population will have become so different that they can no longer breed to produce fertile offspring and there will be two separate species
46
What are chromosomes
They're found in the nucleus and they carry genes
47
What are they symptoms of cystic fibrosis
Recessive Genetic disorder so both parents must be carriers or sufferers There's lots of mucus produced by the body in the air passages gut and pancreas Breathing difficulties Lung infections Malnutrition and fertility problems
48
Wha is genetic screening
When a cells genes are analysed to find out if it carries a specific alleles
49
What is sickle cell anaemia
Causes funny shaped red blood cells Which can get stuck in the capillaries depriving the body cells of oxygen Symptoms are dizziness, tiredness, painful joints and muscles, fever anaemia It is a recessive genetic disorder

Biology B1 (3 decks)

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