IGCSE Biology

Describe a recessive allele as an allele that is only expressed when there is no dominant allele of the gene present in the genotype

Describe a dominant allele as an allele that is expressed if it is present in the genotype

State that a heterozygous individual will not be pure-breeding

Describe heterozygous as having two different alleles of a particular gene

Describe homozygous as having two identical alleles of a particular gene

Describe phenotype as the observable features of an organism

Describe genotype as the genetic make-up of an organism and in terms of the alleles present

Describe meiosis as a reduction division in which the chromosome number is halved from diploid to haploid resulting in genetically different cells (details of the stages of meiosis are not required)

State that during mitosis, the copies of chromosomes separate, maintaining the chromosome number in each daughter cell

State that the exact replication of chromosomes occurs before mitosis