BIOL4 CHAPTER 8 KEY WORDS

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Genotype
the genetic make up of an organism
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Mutation
a change in the sequence of DNA
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Phenotype
characteristics of an organism, often visible as a result of genotype and effects of environment
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Modification
change to phenotype that is not inherited by future generations
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Gene
length of DNA on a chromosome usually coding for a particular polypeptide
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Allele
one of the different forms of a gene
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Locus
position of a gene on a chromosome
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Homologous chromosomes
a pair of chromosomes that have the same gene loci and therefore determine the same characteristics
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Homozygous
where the alleles on the matching pair of chromosomes are the same i.e. BB
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Heterozygous
where the alleles on the matching pair of chromosomes are different i.e. Bb
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Dominant allele
the allele of the heterozygote that is always expressed in the phenotype
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recessive allele
allele of the heterozygote that is not expressed in the phenotype
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Homozygous dominant
a homozygous organism with two dominant alleles
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Homozygous recessive
a homozygous organism with two recessive alleles
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Multiple alleles
gene that has more than 2 possible allels i,e. blood group ABO
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Co- dominance
condition in which both alleles for one gene in a heterozygous organism contributes to the phenotype
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Gametes
sex cell that fuses with another during random fertilization
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Gene pool
all the alleles of all the genes of all the individuals in a population at any one time
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allele frequency
the number of times an allele occurs in a gene pool
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diploid (2n)
terms applied to cells in which nucleus contains two sets of chromosomes ( somatic cells)
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haploid
term referring to cells that contain only a single copy of each chromosome (gametes)
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DNA
deoxyribose nucleic acid
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clone
a group of genetically identical organisms formed from a single parent as a result of asexual production of artificial means
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Card 2

Front

a change in the sequence of DNA

Back

Mutation

Card 3

Front

characteristics of an organism, often visible as a result of genotype and effects of environment

Back

Preview of the back of card 3

Card 4

Front

change to phenotype that is not inherited by future generations

Back

Preview of the back of card 4

Card 5

Front

length of DNA on a chromosome usually coding for a particular polypeptide

Back

Preview of the back of card 5
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