Why Organisms are different
Offspring resmeble their parents because they conain genetic information passed onto them by their parents.
Chromosomes and genes
- Chromosomes, found in the cell necleus contain many genes.
- A gene is a section of DNA, which carries coding for a particular protien.
- Different genes control the development of different characterisitcs of an organism.
- Many genes are needed to carry all the genetic information for a whole organism.
Number of genes and chromosomes varies from species to species. Humans have 46 choromoes that carry around 30,000 genes in each cell.
Although individuals of a species look similar, they are not usually idenitical these differences are calling variation.
Variation due to genetic causes is inherited variation...
Why Organisms are different 2
...For example, children usually look a little like their father, and a little like their mother. But will not look identical to either of their parents. As they get half of their inherited factors from each parent.
- Eye colour
- Hair colour
- Skin colour
- Lobe/Lobeless ear
Characteristics of animal and plant species can be affected by such factors...
E.g- Eat lots you will become heavier/Eat less skinnier, A plant in the shade will grow taller to get light
Why Organisms are different 3
- Your language
- Your religion
- Flower colour in hydrangeas (as these plants produce blue flowers in acidic soil and pink flowers in alkaline soil)
Combined genetic and enviromental factors
Some features vary due to a combination of the two factors.
E.g Identical twins inherit exactly the same genetic information from their parents. But if you take a pair of twins and twin A has eaten more than twin B, twin A is likely to end up heavier.