Reproduction and Growth

Question 1

what is a species?

Answer 1

a group of organisms that can interbreed and produce fertile offspring

Question 2

why does variation occur?

Answer 2

because all offspring are different

Question 3

why is variation important?

Answer 3

for the survival of the species

Question 4

how many chromosomes does each body cell contain?

Answer 4

46 chromosomes

Question 5

how many sets of chromosomesdoes each body cell have?

Answer 5

2 sets

Question 6

what process is new body cells made by?

Answer 6

mitosis

Question 7

what is thef irst stage of mitosis?

Answer 7

parent cell

Question 8

second stage?

Answer 8

chromosomes become visible in the nucleus

Question 9

third stage?

Answer 9

chromosomes line up at the equator

Question 10

fourth stage?

Answer 10

chromatids are pulled apart ro either pole by spindal fibres

Question 11

fifth stage?

Answer 11

parent cell divides to produce two new cells

Question 12

how many chromosomes is in a human gamete?

Answer 12

23 chromosomes

Question 13

what is mitosis the process of?

Answer 13

cell division

Question 14

what is tranaported from foetus to mother?

Answer 14

carbon dioxides and wastes

Question 15

what can harm foetul development?

Answer 15

alcohol, tobacco, radiation

Question 16

where are chromosomes found?

Answer 16

in the nucleus of a cell

Question 17

what are chromosmes made from?

Answer 17

dna

Question 18

how many sets of chromosomes does a zygote contain?

Answer 18

two sets

Question 19

what deos the zygote divide into?

Answer 19

a ball of cells called a embryo and implants into the wall of the uterus

Question 20

what does the embryo then develop into?

Answer 20

a foetus

Question 21

what does the placenta allow for the mothet and foetus?

Answer 21

exchange of materials between mother and foetus blood

Question 22

what is transported from mother to foetus?

Answer 22

glucose and oxygen

Question 23

how many chromosomes does a human sex cell contain?

Answer 23

23 chromosomes

Question 24

what another word for sex cells?

Answer 24

gametes

Question 25

how many sets of chromosomes does each sex cell contain?

Answer 25

1 set

Question 26

what process is new sex cells made by?

Answer 26

meiosis

Question 27

what is the male gamete?

Answer 27

sperm

Question 28

where is sperm produced?

Answer 28

in the testes

Question 29

what is the female gamete?

Answer 29

egg

Question 30

where are eggs produced?

Answer 30

in the ovary

Question 31

where is the site of fertilisation?

Answer 31

in the oviduct

Question 32

what is thecell produced after fertilisation called?

Answer 32

zygote