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3.1 Genes

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Define "gene".​



Understanding: A gene is a heritable factor that consists of a length of DNA and influences a specific characteristic.
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Terms in this set (24)
Define "gene".​



Understanding: A gene is a heritable factor that consists of a length of DNA and influences a specific characteristic.
A gene is a sequence of DNA nucleotides that codes for an RNA or protein that in turn influences a trait/characteristic.
Define "gene locus."



Understanding: A gene occupies a specific position on a chromosome.
A gene locus is the location of a gene on a chromosome. Each chromosome carries many genes.
Define "allele."



Understanding: The various specific forms of a gene are alleles.
An allele is a version/variation of a gene. Most genes come in a variety of different forms.

For analogy: if there is an ice cream gene , then the alleles would be vanilla, chocolate and mint.
Describe an example of a gene with multiple alleles.



Understanding: The various specific forms of a gene are alleles.
Nearly all genes have multiple alleles (multiple versions). For example, in humans the ABO blood type is controlled by a single gene, the isoagglutinogen gene (I for short). The I gene has three common alleles:
I^A: codes for antigen type A
I^B: codes for antigen type B
i: codes for no antigen
State similarities between alleles of the same gene.​



Understanding: The various specific forms of a gene are alleles.
Alleles of the same gene are found at the same locus on homologous chromosomes, have mostly the same nucleotide sequence and code for the same general type of protein (for examples the A and B alleles for blood type both code for a membrane embedded protein).