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  • How many genes are there for each characteristic? Sometimes these genes can be slightly different. These different versions we call alleles. Process check – if 15 mins or less, then go onto completion of the handout, otherwise go onto the white mouse example and then onto the handout
  • How many genes are there for each characteristic? Sometimes these genes can be slightly different. These different versions we call alleles. Process check – if 15 mins or less, then go onto completion of the handout, otherwise go onto the white mouse example and then onto the handout
  • If you unravel the chromosome – makes up an extremely long thread – thread is DNA
  • DNA made up thousands of units called nucleotides Looks like a spiral staircase The most important part of DNA is the base pairs which form the rungs. Made up of 4 base pairs only. These are called adenine, thymine, guanine and cytosine. 40,000 genes in humans. Telegraph and argus, Cheltenham and Gloucester. All DNA in all molecules is made up of these 4 base pairs only. So Whatever you try and look at – always have the same. Imagine all the genes in the world and all the different species in the world have the same DNA. It just depends on the way the DNA is put together. In human genome there are 2.85 billion rungs which have all been sequenced by scientists as part of the Human Genome Mapping project.

Inheritance opt Inheritance opt Presentation Transcript

  • 100’s of free ppt’s fromwww.pptpoint.com library Genetics and inheritance Aim: 1. To recall the important terms that relate to genetics and inheritance (KS4) 2. Describe the basic structure of DNA
  • In your own words, explain the following terms 1. Chromosome 2. Gene 3. Features 4. Gametes 5. Zygote 6. Diploid 7. Allele 8. Homozygous 9. Heterozygous 10. Selective breeding 11. Genetic engineering 12. Meiosis 13. Mitosis 14. Sexual reproduction 15. Asexual reproduction 16. Mutations 17. Dominant 18. Recessive
  • The i nstru cells ction what s tha carrie we lo t tell d in t ok lik 23 pa hese. e are irs of Therenorm them are al hu man in a cell.
  • These are the unitswhich make upchromosomes.Responsible forinheritance of specificcharacteristics
  • These are things like eye colour, skin colour and hair colour. They are controlled by genes.
  • Sperm and egg cells are both this type of cell.Contain half the amount of DNA of normal diploid cells
  • When a sperm and egg cell fuse together, they produce this.
  • We use this word to describe cells which contain the full complement of geneticmaterial. In humans this would be 46 chromosomes (23 pairs)
  • The different versions of genes
  • All e ge les ne of (ca are a gdo n be ide iven mi na eithe ntica nt l or r rec es siv e
  • Alleles of a given geneare not identical
  • Where plants and animals with useful or desired traits are bred together to produce offspring with those desired traits
  • The altering of the character of an organism byinserting genes from another organism
  • Division of a cell to produce 2 daughter cells which each has the same number and kind of chromosomes as the mother cell
  • Type of reproduction that involves fusion of gametes
  • Repro ducti indiv on wh idualfrom s are ereby a sing produ le par ced ent
  • Random change in the geneticmaterial of the cell
  • The allele that is expressed where an individual is heterozygous
  • The allele that is ‘hidden’ (not expressed) when an individual is heterozygous for a given gene
  • What does it look like?