BIOLOGY PAPER 2.WITH 100% ACCURATE QUESTIONS AND ANSWERS .
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Course
Biology
Institution
Biology
BIOLOGY PAPER 2.WITH 100% ACCURATE QUESTIONS AND ANSWERS .BIOLOGY PAPER 2.WITH 100% ACCURATE QUESTIONS AND ANSWERS .BIOLOGY PAPER 2.WITH 100% ACCURATE QUESTIONS AND ANSWERS .BIOLOGY PAPER 2.WITH 100% ACCURATE QUESTIONS AND ANSWERS .BIOLOGY PAPER 2.WITH 100% ACCURATE QUESTIONS AND ANSWERS .BIOLOGY P...
Polydactyly -answer is-Have extra fingers or toes. Dominant condititon meaning
you only need one big allele to get such as in a heterozygous pair e.g. Pp
Embryo Screening -answer is-Embryos are tested for certain conditions and only
normal embryos are imprinted. It is very expensive, many embryos are destroyed
and may lead to screening for desired characteristics such as intelligence or
beauty.
Gender -answer is-xy = male xx = female
Variation -answer is-All the differences in the characteristics of individuals in a
population. It is caused by a combination of alleles, the environment and
mutations.
Evolution -answer is-The change in the inherited characteristics of a population
over time through the process of natural selection.
Speciation -answer is-When two groups have become so different that they
cannot interbreed to create fertile offspring as a result of geographical isolation.
Selective breeding -answer is-There are 4 reasons to selectively breed:
Gentle nature
More meat/milk
Larger fruits
Disease resistance
, Select the two largest cows, breed them and repeat. May cause defects
Genetic Engineering -answer is-Identify the gene and isolate with enzymes.
Transfer to a vector (plasmid or virus)
Transfer gene into the desired organism at an early stage.
It may be harmful to crops and it may damage the environment but it can be used
to treat disaese
Cuttings -answer is-1. Remove a small growing part (meristem at shoot)
2. Put it in rooting powder
3. Replant it
4. Grow the clone
Been used for 100 years
Tissue culturing -answer is-1. Divide plant into tiny pieces (a few cells)
2. Incubate cells with hormones
3. Must be sterile
It produces a lot of plants quickly and cheaply and can help to preserve rare
species
Embryo cloning -answer is-1. Start with sperm and egg
2. fertilise
3. Allow to develop into an embryo
4. Split the embryo
5. Implant into surrogate mothers
All of the offspring will be the same
Adult cell cloning -answer is-1. Take a body cell and remove the nucleus
2. Take an egg cell and remove the nucleus
3. Put the body cell nucleus in the egg cell
3. Give the cell an electric shock so it splits
4. Insert the embryo that forms into a womb
Darwin -answer is-Studied fossils and geology to discover evolution by natural
selection (the more adapted animals are more likely to survive). 1859 origin of the
species..
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