Biology

  • Created by: JDF39
  • Created on: 14-02-18 11:36
Genetic Variation -
Inherited from parents - Passed on in sex cells ( Gametes ) - Combining of genes from 2 parents causes genetic variation ( No clones )
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Environmental variation -
Condtions that organims live and grow in causes differences between members of the species.
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Survival of the fittest -
Organisms in a species have a variety of different characteristics, the organisms which have the best characteristics suited to its surroundings will have a much higher chance of survival an breeding - passing on their characteristic.
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Specification -
Over time, the phenotype of organisms can change so much because of natural selcetion it can form a new species.
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Causes of Extinction -
Enviroment changes too quickly / New predator kills them all / New disease / Cant compete with another ( new ) species for food / A catastrophic event.
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The water cycle -
1. Evaporation 2. Condensation 3. Precipitation ( Rain / Snow ) 4. Percolation (Water goes through gaps in the soil / rocks. ) 5. Transpiration.
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Quick decay =
Temperature + Moisture + Oxyegn
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Slow(er) Decay =
Keep out of sunlight + Air tight places +Keep below 0 degrees + Dry it
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Bioaccumulation
Toxins build up in a food chain
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Eutrophication
Excessive richness of nutrients within a body of water
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Nervous Control
Fast action - Act for a short time - Precise area ( receptor ) - Stimulated - Impulses in neurones
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Hormonal control
Slow action - Act for a long time - General area - No stimuli - Chemicals - Adrenaline
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Reflex action =
Stimulus ~ Receptor ~ Neurone ~ Spinal cord ( CNS ) ~ Motor Neurone ~ Effector ~ Response
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Synapses
Gaps between neurones
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Rod cells
Rod shaped - Greater numbers - Poor visual acuity - Low light intensity - Greater distribution
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Cone cells
Cone shaped - Good visual acuity - Not sensitive to low intensity
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Light travels through :
Cornea -> pupil -> Lens -> retina
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Endocrine System
Controls hormones , Chemicals , long lasting effect , cover a general area
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Blood Glucose levels rise =
Pancreas releases insulin > In response to insulin target cells take up glucose and the liver converts glucose to glycogen > Blood glucose levels fall > Pancreas produces glucagon >The liver breaks down glycogen into glucose into the blood.
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Food tests
Benedict's - glucose - blue > red Biuret - protein - blue > lilac Sudan 3 - fat - layer of red Iodine - Starch - orange > black
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ADH
Secreted by pituitary gland ~ Steps in to rebalance the water concentration ( Negative feedback ) ~ needed on a hot day more so
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Tropism
Phototropism = Response to light Geotropism = Response to gravity Hydrotropism = Response to water
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Auxins
Group of growth control hormones , IAA causes plants to elongate
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Mitosis
Cell division - Occurs in every cell in the body - everywhere except testes / ovaries - asexual / clone - bacteria
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Meiosis
Occurs only in the sex cells - Sperm ( Animal ) - eggs / ovum cells - Pollen ( male - plants )
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DNA
Double helix - T-A / C - G - bases - Amino acids
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Allele
Each half of a chromosome is an alle
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Homo / Hetro zygous
Homozygous = both the same type of alle heterozygous = One of each type of alle
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Other cards in this set

Card 2

Front

Environmental variation -

Back

Condtions that organims live and grow in causes differences between members of the species.

Card 3

Front

Survival of the fittest -

Back

Preview of the front of card 3

Card 4

Front

Specification -

Back

Preview of the front of card 4

Card 5

Front

Causes of Extinction -

Back

Preview of the front of card 5
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Comments

ShaneMcglinchey

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Heavy flashcards there bro.

Sneha12345

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For the 4th flash card, i think you meant speciation, not specification

Sneha12345

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For the 4th flash card, i think you meant speciation, not specification

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