key definitions

Question 1

differentiation

Answer 1

the process by which a cell becomes specialized for a specific function

Question 2

adaption

Answer 2

any characteristic of an organism that improves is chances of surviving in is enviroment

Question 3

allele

Answer 3

different froms of a gene which occup the same relative positios on a pair of homologous chromosomes
eg. bro and blue alleles of eye colour

Question 4

dominant

Answer 4

a form of a gene that is always expressed whether tere is one copy of I, or two
eg. Brow is a dominant hair colour and can be Bb or BB

Question 5

hormone

Answer 5

a chemical substance produced by an endocrine gland. It is transported in he blood stream to target orgas where it exerts its effect

Question 6

dendron

Answer 6

a nerve fibre that transmits impulses torwards the cell boy of a neuron

Question 7

meiosis

Answer 7

a form of cell division that produces 4 non-identical daughter cells with half the number of chromosomes as the parent cell. forms sex cells/gametes

Question 8

heterozygos

Answer 8

this is when ou have differet alleles for a particular trai eg. Bb for hair colou - one domiant 8brow0 one for reccesive (blonde)

Question 9

gamete

Answer 9

a reproductive cell containing aploid number of chromosomes

Question 10

focusing

Answer 10

the adjustment of the lens of the eye so thatclear images of objects at differet distances are formed on the retina

Question 11

nutrition

Answer 11

the intake of food and he processes hat convert food substances into living matter

Question 12

phagocytosis

Answer 12

the process fo engulfing and ingesting foreign particles such as bacteria by phagoctyes