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631211
Biology B23-24
Descripción
GCSE (Biology) Science Mapa Mental sobre Biology B23-24, creado por Molly Munyard el 13/03/2014.
Sin etiquetas
biology
science
science
biology
gcse
Mapa Mental por
Molly Munyard
, actualizado hace más de 1 año
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Creado por
Molly Munyard
hace más de 10 años
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Resumen del Recurso
Biology B23-24
Characteristics
Determined by...
Genes
Eye colour
Nose shape
Ear lobe shape
The environment
Scars
Learning to speak a language
Genes and the environment
Intelligence
Height
Body mass
Chromosomes
inside the nucleus of every cell
Each body cell...
23 matching pairs of chromosomes
1 member of each pair from dad-sperm
1 member of each pair from mum-egg
contain genes
Contain coded information
The codes control different characteristics of the body
Reproduction
Sexual reproduction
different gametes
Different sex cells
Sperm-dad
Egg-mum
Each gamete-half the number of chromosomes
Female-egg
1 produced each month
Male-Sperm
Hundreds made each day
Each sperm nucleus contains 23 chromosomes
Fertilisation
One sperm will fertilise one egg
Two nuclei fuse together
The chromosomes from each parent pair up
The result is a new individual with a mix of genetic information
This is why offspring have genetic variation
Asexual reproduction
Only one parent is needed
No gametes
No mixing of genetic information
No genetic variation
Offspring are genetically identical to their parent
Cuttings
genetically identical plants
Advantages
Quick and cheap
Genetically identical to the parent
Will have the parent's desirable characteristics
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