biology variation & evolution

• What is variation


  Differences in characteristics
• What causes variation?


  Genetic and environmental factors.
• What are characteristics 


  A feature of a species eg eye colour
• What is inherited variation


  it is caused by genes and mutations in dna passed by the parents
• what is Environmental variation


  It’s caused by your surroundings
• What are types of variations


  Discontinuous and continuous
• What are examples of discontinuous variation


  Eye colour
• Examples of continuous variation


  Hand spam, height etc
• What type of graph does discontinuous variation use


  Bar gragh
• Graph used to display continuous variation 


  Histograms
• What is extinction 


  It is the dying out of a species
• What causes extinction


  main causes could be because of habitat loss or lack of adaptation
• how could we help with extinction


  we could help by donating to charities or share reasons to why you want to help
• how does adaptations help with survival

  adapting helps with finding food, water, mates and shelter
• what is continuous variation


  normally something that is measurable
• what is discontinuous variation


  Something that isn’t within a number range
• Histograms normally produce a bell curve called normal distrubution
• What are chromosomes


  They are long strands of DNA
• What are genes


  They are sections of dna
• What do genes make


  They produce protein which gives us our characteristics
• Where is our DNA kept


  Our DNA is kept in our nucleus
• our DNA coils into long strands which then forms what


  It is formed into chromosomes
• What is the coiled shaped ladder called


  a double helix
• After a baby is made what does it inherit


  The baby inherits genetic material (similiar characteristics)
• every cell in our body has 46 chromosomes except one what is it


  Gametes (sex cells)
• How many chromosomes does a sex cell have

  23 chromosomes
• Why do gametes(sex cells) only have 23 chromosomes 


  in the process of making the baby they all join together from both the mum and dad
• What is evolution


  The process by which living things can change over a very long time
• how long does it typically take for evolution to be completely done with

  it takes by an average of 100s of 1000s of years
• What is mutation


  A change in the DNA sequence of an organism
• could mutations be an advantage in certain environments 


  yes
• Are organisms more likely to survive and pass their genes to further generations 


  Yes
• Does the adaptations continue to run through until the entire species has the gene


  Yes