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bio11

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1813
BIOLOGY 11
1 REPRODUCTION

Higher organisms have specialised

organs for reproduction. Male and

female gametes (sex cells) are

produced, genetic material joining

together at fertilisation.

In plants and lower animals, asexual

reproduction also occurs. A single

organism produces offspring by

separation.
#
2 SEXUAL REPRODUCTION
Sexual reproduction involves:

1) The formation of haploid gametes

   with half the chromosomes of the

   diploid adult. (e.g. egg, sperm,

   pollen, ovum in ovule.)

2) The fusion of gametes to restore

   the diploid chromosome number is

   fertilisation. Gametes may be from

   different organisms (mammal), the

   same organism (some flowers), and

   may or may not be physically

   similar.
#
3 SEXUAL REPRODUCTION
Advantages:

It produces variety.

It may improve the species' chance of

survival.

Disadvantages:

It normally needs two organisms.

The organisms are well-adapted, cannot

be copied.

It is slow.

The offspring are different from both

parents.
#
4 ASEXUAL REPRODUCTION
Asexual reproduction produces
offspring identical to parents by:

BUDDING (yeast, hydra)

BINARY FISSION (bacteria, amoeba)

SPORES (fungi) - but zygospore sexual

PARTHENOGENESIS (stick insect)

VEGETATIVE PROPAGATION (bulb, runners)

Advantages:

It maintains a good strain.
It requires only one individual.
It is rapid.

Disadvantages:

There is no variety.
Organism may not survive disease etc.
#
5 GENETICS
Genetics is the study of inheritance,

and of the reasons for variation

between plants and animals of the same

species.


Early work on pea plants etc. was done

by 19th century Austrian monk, Gregor

Mendel.
#
6 MENDEL'S WORK
Mendel used plants which always bred

'true', e.g. tall.

He then cross-bred a pair of plants,

e.g. tall and short.

All the offspring (F1) were identical

to one parent, called the dominant.

      PARENTS TALL X SHORT

      F1 HYBRID ALL TALL

      TALL IS DOMINANT

      SHORT IS RECESSIVE
#
7 MENDEL'S WORK
Mendel then inbred the F1 hybrids. He

found more of the dominant type, about

3 times as many as the other

(recessive) in the next (F2)

generation.

      F1 TALL X TALL

      F2  3 TALL:

          1 SHORT
#
8 EXPLANATION
There are two genes for each

character.

If they are not the same the dominant

character appears. Each parent gives

one gene to the offspring.

P        TALL ������������ SHORT
          TT        �        tt
                    �
                    
F1      TALL  TALL ���  TALL TALL
         Tt    Tt   �    Tt   Tt
                    �
                    �
                    �
F2      TALL TALL       TALL SHORT
         TT   Tt         Tt    tt

             3 TALL: 1 SHORT
#
9 GLOSSARY OF GENETIC TERMS
GENOTYPE: The genes are actually

          present.

PHENOTYPE: What appears because of the

           genes.

HOMOZYGOUS: Both genes for a character

            are the same.

HETEROZYGOUS: Genes for a character

              are different.

RECESSIVE: The character appears only

           when homozygous.

DOMINANT: The character appears when

          heterozygous.
#
10 EVOLUTION
EVOLUTION: the change in the features
of a population of organisms over many
generations.

EVIDENCE:

1) FOSSILS: Hard parts/impressions of
            organisms preserved in
            sedimentary rock. Pattern
            of species has changed.

2) LIVING FOSSILS: Living organisms
                   which resemble
                   fossils more than
                   other living forms.
                   May provide a link
                   between groups.

3) ANATOMY: Similarities in structure
            may show relationships;
            the same basic bone
            arrangements in vertebrate
            limbs.
#
11 EVIDENCE (continued)
4) PHYSIOLOGY: Similarities in enzyme
               function or protein
               structure.

5) LARVAE/EMBRYOS: All vertebrate
                   embryos have gill
                   pouches. Often
                   larvae suggest
                   relationships not
                   apparent in adults.

6) BIOGEOGRAPHY: Marsupials confined
                 to Australia as
                 separation took place
                 before placental
                 mammals appeared?

7) DIRECT EVIDENCE: The changes in
                    bacteria and
                    insects after
                    drugs/DDT.
                    Peppered moth.
#
12 NATURAL SELECTION
DARWIN'S THEORY

1) All organisms produce more

   offspring than could survive,

   but.....

2) Populations stay more or less

   constant, so there must be a

   struggle for survival.

3) In any species there is variation,

   and ....

4) Some varieties will be better

   adapted to the environment. These

   are more likely to survive:

   survival of the fittest.
#
13 OTHER THEORIES

LAMARCK suggested that acquired

characters are inherited, i.e. that

any features developed during an

organism's life were passed to

offspring. In modern terms this would

be inheritance of phenotypes, not

genotypes. (see screen 9).

The CREATIONIST view is that all

living (and fossil) variety was

created at once - dated by USHER at

4004 BC.
#
T
#1
2
(a) The fusion of gametes is called

    .....

(b) How many chromosomes does a

    gamete have, compared with an

    adult cell?
2
~
FERTILISATION
~
HALF
#2
2
Name the 2 gametes produced by

mammals.
2
~
SPERMS
SPERM
EGGS
EGG
OVUM
~
EGGS
SPERMS
EGG
SPERM
OVUM
#3
3
In which type of reproduction is

variety produced?
1
SEXUAL
#4
4
Which type of reproduction produces

offspring identical to the parents?
1
ASEXUAL
#5
5
What is the study of inheritance

called?
1
GENETICS
#6
5
Whose work forms the basis of

genetics?
1
MENDEL
MENDEL'S
GREGOR MENDEL
GREGOR MENDEL'S
#7
9
The genes present in an organism make

up its .....
1
GENOTYPE
#8
9
Different genes for a character mean

that the organism must be .....
1
HETEROZYGOUS
#9
10
What name is given to the gradual

change in a population over many

generations?
1
EVOLUTION
#10
12
Who first put forward the theory of

evolution by natural selection?
1
DARWIN
CHARLES DARWIN
e
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000009f0  74 0d 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |t.              |
00000a00  20 20 20 20 20 20 90 0d  20 20 20 20 20 20 20 20  |      ..        |
00000a10  20 20 20 20 20 20 20 20  20 20 20 20 90 0d 20 20  |            ..  |
00000a20  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
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00000a40  20 54 41 4c 4c 20 20 20  20 20 20 20 54 41 4c 4c  | TALL       TALL|
00000a50  20 53 48 4f 52 54 0d 20  20 20 20 20 20 20 20 20  | SHORT.         |
00000a60  54 54 20 20 20 54 74 20  20 20 20 20 20 20 20 20  |TT   Tt         |
00000a70  54 74 20 20 20 20 74 74  0d 0d 20 20 20 20 20 20  |Tt    tt..      |
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00001810  65 0d                                             |e.|
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