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Further mutations can also cause absolute infertility. If an interbreeding population contains one group in which (for example) chromosomes A and B have fused, and another population in which chromosomes B and C have fused, both populations will be able to interbreed with the parent population.
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from one parent cannot successfully combine with all gametes of the other parent. However, when both parents contain matching chromosomal patterns, this obstacle does not occur. Further mutations in one group will not flow as rapidly into the other group as they do within the group in which it
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However, the two subpopulations will not be able to breed successfully with each other if the doubling of chromosome B is fatal. Similar difficulties will occur for incompatible translocations of material.
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In a translocation, genetic material is transferred from one chromosome to another, either symmetrically or asymmetrically (a
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72:, Brazilian rodents, and an enormous variety of other animals and plants. In one instance it has been found in a human.
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In some cases of differing counts, the difference in chromosome counts is the result of a single chromosome undergoing
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94:
47:, where it splits into two smaller chromosomes, or two undergoing fusion, where two chromosomes join to form one.
83:
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33:
231:
Elrod DA, Beck ML, Kennedy ML (October 1996). "Chromosomal variation in the southern short-tailed shrew (
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180:"Chromosomal Polymorphism as Detected by C-Banding Patterns in Chilean Alfalfa Germplasm"
52:
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57:, for example, is an extreme case where the polymorphism was present within a single
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279:
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112:. Polymorphisms will generally result in a level of reduced fertility, because some
79:. This results in cells which contain multiple copies of complete chromosome sets.
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109:
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29:
195:
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Borin, Luciana
Andreia; Isabel Cristina Martins-Santos (September 2000).
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Bauchan, Gary R.; T. Austin
Campbell; M. Azhar Hossain (July 1, 2002).
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37:
25:
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All forms of chromosomal polymorphism can be viewed as a step towards
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Possessing chromosomes of varying shapes is generally the result of a
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In an inversion, a segment of a chromosome is flipped end-for-end.
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where more than one version of a trait is present in a population.
335:"The 44 Chromosome Man And What He Reveals About Our Genetic Past"
69:
75:
Another process resulting in differing chromosomal counts is
140:"Intra-individual numerical chromosomal polymorphism in
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Trichomycterus davisi (Siluriformes, Trichomycteridae)
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50:This condition has been detected in many species.
8:
303:
162:
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144:from the Iguaçu River basin in Brazil"
7:
278:Thales Renato O. de Freitas (1997).
14:
337:. The Tech Museum. Archived from
333:Barry Starr (February 26, 2010).
305:10.1590/S0100-84551997000100001
164:10.1590/S1415-47572000000300018
151:Genetics and Molecular Biology
28:contains members with varying
1:
292:Brazilian Journal of Genetics
280:"Chromosome polymorphism in
64:It has also been studied in
104:Implications for speciation
380:
95:Robertsonian translocation
84:chromosomal translocation
24:is a condition where one
196:10.2135/cropsci2002.1291
36:is a general concept in
22:chromosomal polymorphism
286:Rodentia-Octodontidae
117:originally occurred.
88:chromosomal inversion
341:on December 6, 2011.
233:Blarina carolinensis
212:on December 1, 2005
359:Classical genetics
249:10.1007/BF00121367
32:counts or shapes.
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320:"Google Scholar"
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282:Ctenomys minutus
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206:. Archived from
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243:(2): 199–203.
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157:(3): 605–607.
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53:Trichomycterus
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190:(4): 1291–7.
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339:the original
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216:November 10,
214:. Retrieved
209:the original
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184:Crop Science
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61:individual.
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34:Polymorphism
21:
15:
364:Chromosomes
353:Categories
125:References
110:speciation
77:polyploidy
30:chromosome
265:20111391
237:Genetica
204:85405717
59:chimeric
18:genetics
257:8999000
114:gametes
66:alfalfa
45:fission
38:biology
26:species
263:
255:
202:
70:shrews
55:davisi
298:(1).
261:S2CID
200:S2CID
147:(PDF)
253:PMID
235:)".
218:2005
300:doi
245:doi
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288:)"
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.