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382943
B1 Variation and inheritance
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Science (Biology ) Mind Map on B1 Variation and inheritance, created by saadiecook on 23/11/2013.
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biology
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saadiecook
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saadiecook
almost 11 years ago
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Resource summary
B1 Variation and inheritance
Inherited characteristics
Some human characteristics such as facial features can be inherited. They can be dominant or recessive
Alleles are different versions of the same gene
Chromosomes
Most body have the same number of chromosomes. The number depends on the species of organism. Humans have 23 paris
Sex chromosomes determine sex in mammals. Females have identical sex chromosome called XX, males have different sex chromosomes called XY
A sperm will carry either and X or a Y chromosomes. All eggs will carry and X chromosome
Genetic Variation
Genetic variation is caused by mutations which are random changes in genes or chromosomes
A monohybrid cross
A monohybrid cross involves only one pair of characteristics controlled by a single gene, one allele being dominant and one recessive
Homeozygous means having identical alleles, heterozygous mean having different alleles
A persons genotype is their genetic make-up, heterozygous means having different alleles
Inherited disorders
They are caused by faulty genes
Many person and ethical issues are raised; in deciding to have a genetic test, by knowing the risks of passing on and inherited disorder
Inherited disorders are caused by faulty alleles
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