Silent Mutation At Biology Glossary

What is it? mutation in which the function of the protein product of the gene is unaltered.

Bio Definition Added By: Jayden

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Bio Term dosage compensation is A mechanism by which species with sex chromosomes ensure that the homogametic sex does not have too much or the heterogametic sex too little activity of loci on the homogametic sex chromosome. The process, in organisms using a chromosomal sex determination mechanism (such as XX versus XY), that allows standard structural genes on the homogametic sex chromosome to be expressed at the same levels in females and males, regardless of the number of homogametic sex chromosomes. In mammals, dosage compensation operates by maintaining only a single active X chromosome in each cell (see Lyon hypothesis), while in Drosophila it operates by hyperactivating the single male X chromosome.

Bio Term Ampicillin (Amp) is An antibiotic that inhibits crosslinking of peptidoglycan chains in the cell wall of eubacteria. Cells growing in the presence of ampicillin synthesize weak cell walls, causing them to burst due to the high internal osmotic pressure. Amp resistance encoded by most transposons and plasmids is due to a periplasmic Beta-lactamase that breaks the Beta-lactam ring of ampicillin. Ampicillin is a derivative of penicillin.

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Bio Term fixed allele is An allele for which all members of the population under study are homozygous, so that no other alleles for this locus exist in the population.

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