Word bank 3 - Acentric chromatid-lacks a centromere;...

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Acentric chromatid-lacks a centromere; produced when crossing over takes place within a paracentric inversion. The acentric chromatid does not attach to a spindle fiber and does not segregate in meiosis or mitosis; so it is usually lost after one or more rounds of cell division Acrocentric chromosome-chromosome in which the centromere is near one end, producing a long arm at one end and a knob, or satellite, at the other end Additive genetic variance-component of the genetic variance that can be attributed to the additive effect of different genotypes Adjacent 1 segregation-type of segregation that takes place in a heterozygote for a translocation. If the original, nontranslocated chromosomes are N1 and N2 and the chromosomes containing the translocated segments are T1 and T2, then adjacent-1 segregation takes place when N1 and T2 move toward one pole and T1 and N2 move toward the opposite pole Adjacent 2 segregation-type segregation that takes place in a heterozygote for a translocation. If the original, nontraslocated chromosomes are N1 and N2 and the chromosomes containing the translocated segments are T1 and T2, then adjacent-2 segregation takes place when N1 and T1 more toward one pole and T2 and N2 move toward the opposite pole Allelic frequency-proportion of a particular allele Allopolyploidy-condition in which the sets of chromosomes of a polyploidy individual possessing more than two haploid sets are derived from two or more species Alternate segregation-type of segregation that takes place in a heterozygote for a translocation. If the original, nontranslocated chromosomes are N1 and N2 and the chromosomes containing the translocated segments are T1 and T2, then alternate segregation takes place when N1 and N2 move toward one pole and T1 and T2 move toward the opposite pole Aneuploidy-change from the wild type in a the number of chromosomes; most often an increase or decrease of one or two chromosomes Artificial selection-selection practiced by humans Ascospore- Autopolyploidy-condition in which all the sets of chromosomes of a polyploidy individual possessing more than two haploid sets are derived from a single species Balance hypothesis-proposes that much of the molecular variation seen in natural populations is maintained by balancing selection that favors genetic variation Branch-evolutionary connections between organisms in a phylogeneic tree Broad sense heritability-proportion of the phenotypic variance that can be attributed to genetic variance C value-haploid amount of DNA found in a cell of an organism Centromere mapping Centromeric sequence-DNA sequence found in functional centromeres Chromatosome-a nucleosome and a n H1 histone protein Chromosomal puff-localized swelling of a polytene chromosome; a region of chromatin in which DNA has unwound and is undergoing transcription Chromosomal scaffold protein-protein that plays a role in the folding and packing of the chromosome, revealed when chromatin is treated with a concentrated salt solution, which removes histones and some
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Word bank 3 - Acentric chromatid-lacks a centromere;...

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