key area 6

Question 1

define variation

Answer 1

the differences between members of the same species

Question 2

what is a mutation?

Answer 2

it is a random change in the number or structure of an organisms chromosomes or DNA

Question 3

when do mutations occur?

Answer 3

very rarely, they are random & only the source of new alleles.

Question 4

How can mutations affect survival

Answer 4

they may be neutral, confer an advantage or disadvantage to survival.

Question 5

what happens to the rate or mutation when a mutagenic agent is added?

Answer 5

the rate increases

Question 6

name some mutagenic agents and examples of them

Answer 6

radiation - UV lights, X - rays, gamma rays

chemicals - mustard gas, benzene & agent orange.

Question 7

what is adaptation ?

Answer 7

it is variation within a population(as a result of mutation) makes it possible for a population to evolve overtime in response to changing environmental conditions.

Question 8

mutations can lead to…

Answer 8

adaptations

Question 9

what are adaptations?

Answer 9

inherited characteristics that make an organism well suited to survival in it’s environment & increased its chance of survival

Question 10

what do females do from pipe fry ever month?

Answer 10

ovulate (release an egg)

Question 11

where are eggs produced?

Answer 11

the ovaries

Question 12

what is the function of the uterus?

Answer 12

it’s the area where the embryo develops during pregnancy

Question 13

name the structure:
tube connecting ovary to uterus )where fertilisation occurs

Answer 13

oviduct

Question 14

what is the function of the ovary?

Answer 14

female sex organ where ova (eggs) are produced

Question 15

name the structure:
narrow chanel between the vagina and uterus

Answer 15

cervix

Question 16

the ______ is the _________ reproductive organ where _______ is deposited

Answer 16

vagina
female
sperm

Question 17

Fertilisation is the _______ of the nuclei of two ________ _________ (egg&sperm) to produce a single _______ cell called a ________.

Answer 17

fusion
haploid gametes
diploid
zygote

Question 18

what part of the flowering plant contains the male gamete?

Answer 18

pollen grains

Question 19

what part of the plant contain the female gamete?

Answer 19

ovules

Question 20

what are flowers responsible for?

Answer 20

sexual production in flowering plants

Question 21

ovules are produced in the ________ and pollen grains are produced in the ________

Answer 21

ovary
anthers

Question 22

what is pollination?

Answer 22

it’s the transfer of pollen grains from an anther to a stigma

Question 23

one the ______ ____ has landed on the stigma, it ________ to the presence of _______ on the stigma and uses it an an ________ ______ to form a pollen ______.

Answer 23

pollen grain
responds
sugar
energy source
tube

Question 24

the haploid pollen nucleus fuses with the _______ ______ cell nucleus to form a ________ zygote

Answer 24

haploid egg
diploid

Question 25

what is produced after a diploid zygote forms & what is this capable of doing?

Answer 25

seed is produced which is capable of germinating and growing into a plant