939424
Descrição
Mapa Mental por leahturner1999, atualizado more than 1 year ago
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Criado por leahturner1999
mais de 12 anos atrás
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Alleles, genotypes and phenotypes
- alleles and genotypes
- chromosomes in all cells, except for the sex cells, come in pairs. This means the cell has two copies of every gene.
- The alternative genes for each characteristic are called ALLELES. the combination of two alleles in a fertilised egg id called the GENOTYPE.
- The alternative genes for each characteristic are called ALLELES. the combination of two alleles in a fertilised egg id called the GENOTYPE.
- chromosomes in all cells, except for the sex cells, come in pairs. This means the cell has two copies of every gene.
- if the two chromosomes have the same alleles for a certain gene, the genotype HOMOZYGGOUS.
- if the two chromosomes have different alleles for the gene, the genotype is HETEROZYGOUS.
- if the two chromosomes have different alleles for the gene, the genotype is HETEROZYGOUS.
- Dominant or recessive?
- if the alleles are different, the DOMINAT alleles 'trumps' RECESSIVE alleles
- so if the dominant allele is in the genotype this characteristic will be shown in the phenotype
- we write the genotype as a pair of letters of the pair of alleles. a dominant allele is given a capital letter and recessive allele is given a lower- case
- we write the genotype as a pair of letters of the pair of alleles. a dominant allele is given a capital letter and recessive allele is given a lower- case
- so if the dominant allele is in the genotype this characteristic will be shown in the phenotype
- if the alleles are different, the DOMINAT alleles 'trumps' RECESSIVE alleles
- Flower colour is controlled by a single gene. let R represent the dominant allele for red petals and r the recessive allele for white petals. the table below show the possible genotypes and phenotypes for these allele
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