Reproduction

Question 1

sexual

Answer 1

sexual differences: t

RANDOM fertilisation of gametes . the male and female gametes fuse, meiosis they become a zygote (fertilised egg cell)
This contains the full 46 chromosomes, half of which came from the father and half from the mother - we say the zygote has a diploid nucleus

-increases genetic variation(gene pool)
-disease less likely to affect due to variation
-species can adapt to new environments due to variation giving them survival advantage. natural selection.

takes time and energy. slower as mate needs to be found. difficult for isolated members of species to produce

Question 2

asexual advantage

Answer 2

-mitosis often produces large numbers so population increased rapidly
clones
offspring produced in favourable conditions

Question 3

sperm help swim

Answer 3

streamlined light small easy to swim

Question 4

male and female structure reproductive

Question 5

testosterone

Answer 5

controls sex drive/agression

development of secondary sexual characteristics during puberty

sperm development and production

Question 6

self pollination

Answer 6

occur when stamen and carpel develop at same time

Question 7

Fallopian tube lined with

Answer 7

ciliated cells

Question 8

seed germination needs

Answer 8

o2, water, temp..

Question 9

cotyledon

Answer 9

tures known as cotyledons surround the embryo
Some plants have one cotyledon, whereas others have two
The cotyledons contain food reserves that supply the young seedling with food (and, therefore, energy for growth) when the seed starts to germinate
The cotyledons fulfil this role until the young plant grows its own leaves and becomes capable of making its own food via photosynthesis
After taking in water, the seed coat (testa) splits
This leads to the production of the plumule (the first emerging shoot) and radicle (the first emerging root)

Question 10

menstrual cycle

Answer 10

-fsh secreted by pituitary gland
-causes development maturing of egg in ovary
-as egg matures causes ovary to release oestrogen
-oestrogen builds uterus walls and thickens them
-oestrogen stimulates secretion of LH from pituitary gland.
-LH causes egg to be released (menstruation)
-which then causes progesterone which inhibits release and maintains uterus lining. if egg unfertilised and no plant breaks down

Question 11

amniotic sac

Answer 11

cushions baby blows to abdomen. allow to move and maintain temp.

Question 12

dcontinuous variation

Answer 12

charactertersitcs like weight or height come in range and change./ discontinuous is in groups rather than range like blood group

Question 13

male reproductive

Answer 13

prostate gland-produces fluid called semen that provides sperm cells with nutrients and energy for respiration

-sperm duct passes thrpg