(I)GCSE Topic 3.16 DNA and Genetic Information

(I)GCSE Topic 3.15 Genes

(I)GCSE Topic 3.14 Chromosomes

 - Chromosomes = genetic information of the cell
 - Different organisms have different amount of chromosomes
      - e.g. Cats have 38, Chickens have 78, Chimp has 42, and Humans have 46
 - Chromosomes are known to operate in pairs = "Homologous Pairs"

(I)GCSE Topic 3.6 Germination Conditions

- TESTA = Seed Coat 

- SCAR = from where the seed is detached from the ovary wall

- MICROPYLE = where the pollen tube enters the seed

>Conditions needed to bring about Germination<

- Water 

- Reasonable Temperature - higher temperature - enzymes bring about starch => Maltose (stored in cotyledon)

- Oxygen - Aerobic respiration

(I)GCSE Topic 3.4 Plant Fertilisation

- Pollen Nucleus will fertilise the Ovule
  - formation of the Zygote - grow into the embryonic plant
- Outside the Ovule forms a seed coat = TESTA
- Cotyledon = food store for the seedlings
                    = supports the plant till it develops a fresh sets of leaves

(I)GCSE Topic 3.1 Sexual and Asexual Reproduction

>Describing differences between Sexual and Asexual Reproduction<

- Gametes = Cells
- Type of cell division that produces Gametes is called Meiosis
   - Effects = 1/2 the total adult number of male chromosomes in the Gametes Cell
 - Total Number of cells in an adult human male = 46 cells
 - Total Number of cells in an adult Gametes male = 23 cells

YEAR 11