What is an allele?
Reveal answer
A different version of a gene.
Key words: version
4(b) INHERITANCE · RECALL
4.19 Alleles
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What is a dominant allele?
Reveal answer
One expressed even with one copy.
Key words: one copy
What is a recessive allele?
Reveal answer
Only expressed with two copies.
Key words: two copies
What is meant by the term allele?
Reveal answer
Alternative DNA-sequence form of a gene.
Key words: allele
What is meant by the term autosomal?
Reveal answer
Located on a chromosome other than a sex chromosome.
Key words: autosomal
What is meant by the term genotype?
Reveal answer
Allele combination of an organism at one or more loci.
Key words: genotype
What is meant by the term phenotype?
Reveal answer
Observable or measurable characteristics produced by genotype and environment.
Key words: phenotype
Gene, allele and genotype, Gene. Meaning? Example model?
Reveal answer
Meaning: DNA sequence with a functional product. Example model: Pigment-production gene.
Key words: Gene
Gene, allele and genotype, Allele. Meaning? Example model?
Reveal answer
Meaning: Sequence version of that gene. Example model: A or a.
Key words: Allele
Gene, allele and genotype, Locus. Meaning? Example model?
Reveal answer
Meaning: Chromosome position of the gene. Example model: Corresponding site on homologues.
Key words: Locus
Gene, allele and genotype, Genotype. Meaning? Example model?
Reveal answer
Meaning: Allele combination in an individual. Example model: AA, Aa or aa.
Key words: Genotype
Gene, allele and genotype, Phenotype. Meaning? Example model?
Reveal answer
Meaning: Observable/measurable outcome. Example model: Pigment amount.
Key words: Phenotype
True or false, and why? “An individual always has every allele in the population.”
Reveal answer
False. A diploid individual normally has two alleles at one autosomal locus.
True or false, and why? “Dominant means common, stronger or better.”
Reveal answer
False. It only describes expression in a heterozygote.
True or false, and why? “Alleles are found at different loci.”
Reveal answer
False. Alleles of the same gene occupy the same locus on homologues.