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Biology 1.9 Revision

Revision cards for NCEA Level 1 Biology 1.9 Paper

Nucleus the central part of the cell containing 46 chromosomes
Deoxyribonucleic Acid (DNA) a complex molecule of which all living things are made up of
Chromosome microscopic gene-carrying body in the nucleus of a cell
Homologous pairs of similar gene or chromosomes
Gene part of the cell which determains inherited characteristics
Allele possible forms of a gene
Nucleotide building blocks of nucleic acids
Base molecules forming a pair which make up the 'rungs' of DNA
Amino Acid organic compound found in proteins
Protein chains of amino acids in different orders
Trait feature of an organism
Dominant a trait that is always expressed even if there is only one allele present
Recessive a trait that will only be expressed if there are two alleles for the same gene present
Genotype the genes that an organism carries
Phenotype the physical appearance of that characteristic that the organism carries
Pure-breed the organism is homozygous for a specific allele
Homozygous having identical alleles for a particular trait
Heterozygous having different alleles for a particular trait
Pedigree Chart a chart that is used to show the appearance of phenotypes of a particular gene for an organisms ancestors one generation to the next
Test Cross a genetic cross between a homozygous recessive and an unknown genotype
Genetic Variation the genetic differences between individuals within a population
Continuous Variation variation that can be measured
Discontinuous Variation variation that can't be measured
Meiosis cell division used to produce gametes
Mitosis cell division used to produce skin cells
Gametes male or female reproductive cells
Zygote a fertilized egg
Created by: LorenK14