AQA GCSE Biology Paper 2 2025 LATEST EXAM.QUESTIONS
AND ANSWERS VERIFIED. GRADE A+ GUARANTEED
Give 2 examples of organisms that reproduce asexually - - ANS✔️--
Bacteria
Some animals&plants
What type of cell division are gametes (sex cells) produced by? - -
ANS✔️--Meiosis
What are the 5 stages of Meiosis - - ANS✔️--1-Duplicate genetic info-
forming 'X' chromosomes that arrange themselves into pairs
2-Chromosomes line up in centre of cell in homologous pairs
3-Pairs pulled apart so each new cell only has one copy of each
chromosome-some of the father's chromosomes and some of the
,mother's go into each cell randomly, but each cell has an equal
amount of chromosomes in total
4-2nd division-chromosomes line up in centre & separated again
5=4 gametes-each with single set of chromosomes
Give 2 details about the 4 gametes produced in meiosis - - ANS✔️--1-
Each contain 1 set of chromosomes
2-Each gamete genetically different
Why are gametes produced in meiosis genetically different? - - ANS✔️--
Because chromosomes are shuffled up during meiosis and each
gamete only gets half of them at random
Explain how/why the cell produced by gamete fusion replicates itself
(3) - - ANS✔️--1) After 2 gametes fused during fertilisation-resulting new
cell divides by mitosis to make copy of itself
2)Mitosis repeats many times to make lots of new cells in an EMBRYO
,3)As embryo develops-cells differentiate into diff types of specialised
cell that MAKE UP WHOLE ORGANISM
How many pairs of chromosomes are in a human body cell? - - ANS✔️--
23 Pairs
What do each of the chromosomes control? - - ANS✔️--22 pairs of
chromosomes are matched/homologous pairs-control
CHARACTERISTICS
23rd pair-XY or XX -Sex defining chromosomes
What are the male and female chromosomes? - - ANS✔️--Males: XY-The
Y chromosome causes male characteristics
Females:XX-combination allows female characteristics to develop
Explain the chances of a child being male/female using a punnet
diagram. - - ANS✔️--50% chance of male and 50% chance of female.
What is homeostasis? - - ANS✔️--The maintenance of a constant
internal environment.
, What is a stimulus? - - ANS✔️--A change in your environment than
requires a response. e.g Light, sound, touch, pressure, pain, chemical
or temperature.
What do the receptors do? - - ANS✔️--Detect the stimulus or change in
environment.
What happens after the receptors? - - ANS✔️--Receptors send messages
to the CNS via the sensory neurone.
What makes up the central nervous system? - - ANS✔️--The brain or
spinal cord
What is an effector? - - ANS✔️--Muscles or glands that bring about a
response.
What do the muscles and glands do in response to stimuli? - - ANS✔️--
Muscles contract and glands secrete chemical substances(hormones).
AND ANSWERS VERIFIED. GRADE A+ GUARANTEED
Give 2 examples of organisms that reproduce asexually - - ANS✔️--
Bacteria
Some animals&plants
What type of cell division are gametes (sex cells) produced by? - -
ANS✔️--Meiosis
What are the 5 stages of Meiosis - - ANS✔️--1-Duplicate genetic info-
forming 'X' chromosomes that arrange themselves into pairs
2-Chromosomes line up in centre of cell in homologous pairs
3-Pairs pulled apart so each new cell only has one copy of each
chromosome-some of the father's chromosomes and some of the
,mother's go into each cell randomly, but each cell has an equal
amount of chromosomes in total
4-2nd division-chromosomes line up in centre & separated again
5=4 gametes-each with single set of chromosomes
Give 2 details about the 4 gametes produced in meiosis - - ANS✔️--1-
Each contain 1 set of chromosomes
2-Each gamete genetically different
Why are gametes produced in meiosis genetically different? - - ANS✔️--
Because chromosomes are shuffled up during meiosis and each
gamete only gets half of them at random
Explain how/why the cell produced by gamete fusion replicates itself
(3) - - ANS✔️--1) After 2 gametes fused during fertilisation-resulting new
cell divides by mitosis to make copy of itself
2)Mitosis repeats many times to make lots of new cells in an EMBRYO
,3)As embryo develops-cells differentiate into diff types of specialised
cell that MAKE UP WHOLE ORGANISM
How many pairs of chromosomes are in a human body cell? - - ANS✔️--
23 Pairs
What do each of the chromosomes control? - - ANS✔️--22 pairs of
chromosomes are matched/homologous pairs-control
CHARACTERISTICS
23rd pair-XY or XX -Sex defining chromosomes
What are the male and female chromosomes? - - ANS✔️--Males: XY-The
Y chromosome causes male characteristics
Females:XX-combination allows female characteristics to develop
Explain the chances of a child being male/female using a punnet
diagram. - - ANS✔️--50% chance of male and 50% chance of female.
What is homeostasis? - - ANS✔️--The maintenance of a constant
internal environment.
, What is a stimulus? - - ANS✔️--A change in your environment than
requires a response. e.g Light, sound, touch, pressure, pain, chemical
or temperature.
What do the receptors do? - - ANS✔️--Detect the stimulus or change in
environment.
What happens after the receptors? - - ANS✔️--Receptors send messages
to the CNS via the sensory neurone.
What makes up the central nervous system? - - ANS✔️--The brain or
spinal cord
What is an effector? - - ANS✔️--Muscles or glands that bring about a
response.
What do the muscles and glands do in response to stimuli? - - ANS✔️--
Muscles contract and glands secrete chemical substances(hormones).
