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biology (0610) > Reproduction > Flashcards

Reproduction Flashcards

(58 cards)

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1
Q

Asexual reproduction

A

process resulting in the production of genetically identical
offspring from one parent

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2
Q

Advantages of asexual reproduction:

A

wild species that are adapted to
the environment can survive.
isolated wild species can
reproduce because only single
parent is required.
crop plants are genetically
identical therefore they have the
same yield and characteristics.
require less energy.
quick
no gametes
favourable characteristics of
parent passed on
dense colonies outcompete other
species
no pollinators required
reliable
no harmful variation

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3
Q

Disadvantage of asexual
reproduction:

A

less variation
lack of diversity in wild plants
risk of overpopulation in wild
plants
competition for resources as all
individuals are close together in
wild plants
wild plants and crops are less
likely to survive to change
environment
no adaptive features in wild
plants
all individuals are susceptible to
the same, diseases/pests in wild
plants
higher risk of extinction in the wild
plants
no evolution in wild plants
genetically identical so higher risk
of inheriting genetic diseases in
both wild and crop plants

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4
Q

Sexual reproduction

A

process involving the fusion of the nuclei of two gametes to
form a zygote and the production of offspring that are genetically different from each
other.

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5
Q

Fertilisation

A

fusion of the nuclei of gametes.

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6
Q

Nuclei of gametes are

A

haploid

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7
Q

nucleus of a zygote

A

is diploid

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8
Q

Advantages of sexual reproduction

A

maintain/ increase, the population in wild plants
allow variation in wild plants
allow adaptation to, new/ changed
environment(s) in wild plants
allow natural selection/ evolution/ formation
of new species in wild plants
random fusion of gametes in wild plants
ability to express recessive trails in wildplants
allows to use of selective breeding in crop
plants

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9
Q

Disadvantages of sexual
reproduction

A

Slow
Lots of energy is
needed
Need 2 parents

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10
Q

Sepals:

A

Protect the flower while it is a bud

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11
Q

Petals:

A

Brightly coloured and attract insects to flowers

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12
Q

Stamen

A

It is male part of flower, consists of long filament and anther at the top which contain pollen grain, which contain male gametes

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13
Q

Carpel:

A

It is the female part of flower. It contains ovary, which contains ovules,
which contains female gamete. At top is style with stigma at the top. function of
stigma is to catch pollen grains.

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14
Q

Insect pollinated flower

A

large, brightly coloured petals, strong scent, nectar to
attract insects towards them. The anther and stigma are inside the flower so that the
insect brush past them and some pollen stick onto them. The insect then goes to
another flower, looking for more nectar. Pollen grains are sticky and spiky so, some
of the pollen it picked up at the first flower sticks onto the stigma of the second
flower when the insect brushes past it. The stigma is sticky, and many pollen grains
get stuck on it.

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15
Q

wind pollinated flower

A

produce much more pollen than insect pollinated flowers.
This is because a lot of the pollen doesn’t land on another flower, so huge amounts
are wasted. Usually no petals because there is no need to attract insects. Their
anthers and stigmas dangle outside the flower, to catch the wind. The filaments of
the anthers are very flexible, so they can swing in the wind and release their pollen.
The feathery stigmas have a large surface area, increasing the chances of catching
pollen.

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16
Q

Pollination

A

transfer of pollen grains from an anther to a stigma.

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17
Q

Self-pollination

A

transfer of pollen grains from the anther of a flower to the
stigma of the same flower or a different flower on the same plant.

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18
Q

Cross-pollination

A

transfer of pollen grains from the anther of a flower to the
stigma of a flower on a different plant of the same species.

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19
Q

Self-pollination doesn’t produce

A

lots of variation. Less capacity to respond to changes in the environment. They don’t rely on pollinators

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20
Q

Cross-pollination produce

A

variation. More capacity to respond to changes in the
environment. They rely on pollinators.

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21
Q

Fertilization occurs when

A

a pollen nucleus fuses with a nucleus in an ovule

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22
Q

Events which occur between pollination
and fertilisation.

A

pollen lands on stigma
pollen (grain) germinates/ pollen (grain)
grows pollen tube
pollen tube grows down the style
reaches the ovule
(tip of) pollen tube breaks open
male gamete travels down the pollen
tube
male gamete enter ovule
(male gamete) fuse with female
gamete
zygote forms.

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23
Q

Events which occur between
fertilisation and production of
seed.

A

zygote (is formed)
divides by mitosis
to form embryo
formation of radicle and
plumule
formation of, cotyledons/
seed leaf/ food reserve
formation of teste/ seed
coat
ref to endosperm
seed formed form ovule

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24
Q

Testes produce

25
Testes produce
testes, as well as providing a sort of climate control system
26
Sperm duct carries
sperm away from testis, it then join up with the urethra just below the bladder
27
Urethra
can carry both urine and sperm at different time
28
Prostate gland
makes semen, a fluid in which sperm can swim in.
29
Function of penis
to enter the vagina and release sperm.
30
Ovaries produce
eggs or egg cells.
31
Oviducts lead the
egg to uterus.
32
Uterus
nourish the developing fetus prior to birth
33
Cervix
allows fluids to pass between uterus and vagina
34
Vagina
the site where sperms are placed after ejaculation
35
Fertilization is the fusion of the nuclei from a
male gamete (sperm) and a female gamete (egg cell).
36
Adaptation of sperm:
flagellum to swim lots of mitochondria to provide energy for swimming by respiration. enzymes in the acrosome to digest its way through the jelly coat.
37
Adaptation of egg cell:
energy store to provide energy and nutrients for the growth and development of zygote after fertilisation. jelly coat hardens after the entry of one sperm to prevent entry of multiple sperms.
38
sperms compared to egg cells
Sperm cells are lot smaller than egg cells. Sperm cells are streamlined and egg cells are round. Sperm cells can move by themselves but egg cells cannot. There are millions of sperms deposited at the vagina but there are maximum of 2 egg cells in female reproductive system.
39
In early development,
the zygote forms an embryo which is a ball of cells that implants into the lining of the uterus.
40
Placenta connects the
embryo to wall of uterus. Placenta is where substances are exchanged between the mother’s blood and the embryo’s blood.
41
Role of placenta in humans:
gas exchange transfer of dissolved nutrients, from maternal (circulation)/ to fetal. transfer of excretory products, from fetal/ to maternal; by diffusion produces/ secretes, (named) hormones; passive immunity/ antibodies, from maternal/ to fetal prevents/ limits, mixing of blood regulating blood pressure maternal/ fetal attachment point red to counter current flow/ maintains concentration gradient
42
Role of amniotic fluid:
protection from (mechanical) shock (of fetus) maintains (constant) temperature (of fetus) allows movement (of fetus) prevents dehydration
43
Amniotic fluid and the amniotic sac:
maintains temperature ; mechanical shock protection ; allows movement (of the fetus) ; provides support (of the fetus) ; provides a sterile environment / prevents infections ; (movement) allows for development of bones and muscles ; ref. to swallowing (of fluid) ; lubrication / AW ;
44
Some pathogens and toxins can pass across
the placenta and affect the fetus
45
Testosterone cause the
secondary sexual characters to develop in boys, like growth of facial hair and pubic hair, broadening shoulders and general muscular development and a deepening voice
46
Oestrogen
cause the secondary sexual characters to develop in girls, like increase in size of breast, growth of pubic hairs, hips become wide
47
Site of production of oestrogen and progesterone in the menstrual cycle is the
ovaries. After ovulation site of progesterone production is corpus luteum. During pregnancy site of progesterone production is the placenta.
48
Changes to the lining of uterus during menstrual cycle:
loss / thinning, of lining (of uterus), at the beginning of the cycle / during first week / between day 1–7 ; regrowth / thickening of, lining (of uterus), during second week / after loss (of lining) / before ovulation ; thickness of lining remains constant, in the last two weeks / at the end of the cycle / after ovulation / if no fertilisation ;
49
The role of FSH.
FSH stimulates, development / growth / maturation, of follicles (in ovary) ; -FSH stimulates, development/growth / maturation, of, egg (cell) / ova / ovum / (female) gamete(s) ; -FSH stimulates, production / release / secretion, of oestrogen (from ovary) ;
50
The role of LH.
(FSH and) LH (surge) stimulates, ovulation / release of egg from ovary LH stimulates (corpus luteum / yellow body / empty follicle), secretion / production / release, of progesterone decrease in LH decreases secretion of progesterone (by corpus luteum) ;
51
The role of estrogen.
Stimulates the uterus to develop a lining (to replace the lining lost during menstruation) Post-ovulation, inhibits FSH and LH production in the pituitary gland.
52
The role of progestogen.
maintains and thickens lining of the uterus inhibits FSH and LH production if fertilisation doesn’t occur, levels drop and menstruation occurs.
53
Sexually transmitted infection (STI)
is an infection that is transmitted through sexual contact.
54
Human immunodeficiency virus (HIV)
is a pathogen that causes an STI.
55
HIV infection may lead to
AIDS
56
Methods of transmission of HIV:
sexual contact sharing contaminated needles sharing contaminated syringes blood transfusion breast milk tissue/ organ transplant
57
HIV is not spread through
saliva
58
Methods to stop the spread of STIs:
never have more than one sexual partner use condoms

biology (0610) (19 decks)

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