Genetic DIagrams
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15 Terms
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Allele
a different version of a gene
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Genotype
the alleles present in an organism
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Phenotype
the characteristics expressed by the organism
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Dominant
an allele that is always expressed even if only one is present
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Recessive
an allele that is only expressed if two are present
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Homozygous
two of the same alleles
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Heterozygous
two different alleles
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Gamete
sex cells e.g. sperm/eggs
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How many chromosomes in the male and female body cell?
46
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How many chromosomes in the gametes?
23
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What are some characteristics controlled by?
a single gene such as fur colour in mice and red-green colour blindness
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What are most characteristics a result of?
multiple genes interacting rather than a single gene
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Why do we have two alleles of each gene in our cells?
-in each pair of chromosomes one came from from the mother and one came from the father
-each chromosome in a pair contain the same genes in the same positions
-this means you have two 'versions'/alleles of each gene
-each chromosome in a pair contain the same genes in the same positions
-this means you have two 'versions'/alleles of each gene
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Monohybrid inheritance
the inheritance of a characteristic controlled by a single gene
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What do monohybrid crosses show?
the probability of different alleles of that gene being inherited by offspring certain parent