Learning Outcomes By the end of this lesson, you should be able
to: Define asexual and sexual reproduction. Describe systems of
reproduction in unicellular and multicellular organisms. Describe
mechanisms of reproduction in unicellular and multicellular
organisms.
Slide 3
There are two very different ways of reproducing: Asexual
reproduction Sexual reproduction Types of Reproduction
Slide 4
Asexual Reproduction in Plants
Slide 5
BULBS Onions Daffodils Look at the examples of asexual
reproduction. Can you give a definition of the process? Look at the
examples of asexual reproduction. Can you give a definition of the
process?
Slide 6
TUBERS Potatoes
Slide 7
RHIZOMES Iris
Slide 8
RUNNERS StrawberrySpider plant
Slide 9
Asexual Reproduction Only involves one parent. Offspring are
completely identical to the parent clones! No gametes (sex cells)
are needed. Very safe and easy no need to find a partner! Common in
small/simple animals, plants and bacteria. Also happens in our body
all the time to replace worn out or dead cells. It also happens in
some bigger plants.
Slide 10
Asexual reproduction in other organisms
Slide 11
Prokaryotes binary fission Describe in your own words what is
happening in this diagram.
Slide 12
1.Look at some other examples of asexual reproduction on pages
178-181. 2.Choose one example and draw and annotate a diagram to
explain the process. 1.Look at some other examples of asexual
reproduction on pages 178-181. 2.Choose one example and draw and
annotate a diagram to explain the process.
Slide 13
Sexual Reproduction
Slide 14
Sexual reproduction involves the production of sex cells called
____________. The gametes are made in the _______________ _______.
The process of cell division that produces the gametes is called
___________. In this process, each gamete only receives ___________
the amount of genetic material of the adult cell (haploid). After
______________, this amount is restored to the full number of
chromosomes in the fertilised cell (diploid).
Slide 15
The Gametes In the animal kingdom, the male gametes are
_________, and the female are _______. In seed-bearing plants, the
male gamete is a cell in the _________ ___________, and the female
is a cell in the ____________. Male gametes are usually very
___________ in size. They are usually ___________ - making their
way to the ovum. Female gametes are ____________ than the male, and
are not ____________. The male organism always produces a
____________ number of gametes than the female.
Slide 16
Fertilisation Fertilisation occurs when the two ____________ of
the ___________ and ___________ f_____. This forms a new, single
cell called a ____________. This cell has a full set of chromosomes
= ______. This cell undergoes cell _____________ to develop into an
______________. In plants, after fertilisation the ovule becomes
the ___________ and the ovary becomes the ____________.
Slide 17
Sexual Reproduction in Plants
Slide 18
Flower Structure Label the following structures on the diagram:
Petal Ovary Stamen Style Stigma Sepal Anther Filament Ovule
Carpel
Slide 19
Slide 20
Flower Structure and Function Complete the card sort to match
the different floral structures with their functions.
Slide 21
Flower Structure and Function STRUCTUREFUNCTION PetalsBrightly
coloured and sometimes scented to attract insects and other
pollinators. SepalsOuter protective covering of the flower bud, can
be coloured like the petals. AntherProduces the pollen.
FilamentHolds up the anther. StamenMale organs, consisting of the
anther and filament. StigmaSticky end of the carpel, which collects
pollen. StyleThe sperm travels down the style from the stigma to
the ovary. OvaryContains ovules. OvuleContains the female nucleus
which develops into seeds once fertilised. CarpelFemale organs,
consists of the stigma, style and ovary.
Slide 22
Pollen grains
Slide 23
When the flower has been pollinated, the sperms meet the eggs,
and seeds form (the offspring!) The ovary turns into the fruit with
seeds inside ready for dispersal. Which of the following are
fruits? Vegetables? Are they produced by sexual or asexual
reproduction? Fruit or Vegetable?
Slide 24
VEGETABLE! ASEXUAL
Slide 25
FRUIT ! SEXUAL
Slide 26
FRUIT! SEXUAL
Slide 27
VEGETABLE ! ASEXUAL
Slide 28
FRUIT! SEXUAL
Slide 29
FRUIT! SEXUAL
Slide 30
VEGETABLE! ASEXUAL
Slide 31
Fruits always come from a ______. Fruits are made through
______ reproduction! flower sexual Now complete the Sexual and
Asexual Reproduction summary sheet. Summary
Slide 32
Advantages and Disadvantages AdvantagesDisadvantages Asexual
Reproduction Sexual Reproduction Create a table to show the
advantages and disadvantages of asexual and sexual reproduction.
Watch the video clip to help. Remember: The video is arguing the
advantages of asexual reproduction. You will need to think up the
advantages of sexual reproduction for yourselves. Create a table to
show the advantages and disadvantages of asexual and sexual
reproduction. Watch the video clip to help. Remember: The video is
arguing the advantages of asexual reproduction. You will need to
think up the advantages of sexual reproduction for yourselves.
Slide 33
Sexual Reproduction in Mammals
Slide 34
The Female Human Reproductive System Label the following
structures on the female reproductive system diagram: Cervix Vagina
Oviduct (fallopian tubes) Ovaries Uterus
The Male Human Reproductive System Label the following
structures on the male reproductive system: Sperm duct (vas
deferens) Seminal vesicle Prostate gland Epididymis Testis Scrotum
Penis Bladder Urethra
Slide 37
Vas deferens (sperm duct) Seminal vesicle Prostate gland
Bladder Prostate gland Vas deferens Urethra Penis Scrotum Testis
Epididymis
Slide 38
Functions Complete the functions table by sorting the functions
with their correct structures. Indicate whether the structure
belongs to either the male or female reproductive system.
Slide 39
The Female Reproductive System UTERUS: The foetus develops here
during gestation. OVARY: Produces ovum. CERVIX: The shorter, narrow
portion of the uterus where it joins with the vagina. VAGINA: An
elastic, muscular canal that extends from the cervix to the outside
of the body. OVIDUCT (FALLOPIAN TUBE): The passage from the ovaries
to the uterus. Carries the ovum. URETHRA: The tube which connects
the bladder to the outside of the body. In females, it only carries
urine. In males, it carries both the semen and the urine, at
separate times.
Slide 40
The Male Reproductive System SPERM DUCT (VAS DEFERENS):
Transport sperm from the epididymis. EPIDIDYMIS: A narrow,
tightly-coiled tube where maturation of the sperms takes place.
Connects the testes to the vas deferens. PENIS: Passes either urine
or sperms outside of the body. Consists of connective tissue,
called erectile tissue, with many blood spaces in it. It allows
sexual intercourse to take place. TESTES: Produce sperm and the
hormone testosterone. SCROTUM: Sac containing testes. Keeps the
testes at optimum temperature for sperm production. SEMINAL
VESICLE: Secretes a large proportion of the fluid that becomes
semen. PROSTATE GLAND: Stores and secretes a slightly alkaline
fluid, which is a constituent of semen. URETHRA