HYBRIDIZATION OF KARYOTYPICALLY DIFFERENTIATED POPULATIONS IN THE
            <i>SCELOPORUS GRAMMICUS</i>
            COMPLEX (IGUANIDAE)

Hall, William P.; Selander, Robert K.

doi:10.1111/j.1558-5646.1973.tb00668.x

Evolution

1973

DOI: 10.1111/j.1558-5646.1973.tb00668.x

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HYBRIDIZATION OF KARYOTYPICALLY DIFFERENTIATED POPULATIONS IN THE SCELOPORUS GRAMMICUS COMPLEX (IGUANIDAE)

William P. Hall

Robert K. Selander

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1980

1987

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Cited by 84 publications

References 30 publications

(31 reference statements)

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Evolution of Sceloporus grammicus complex (Sauria: Iguanidae) in central Mexico II. Studies on rates of nondisjunction and the occurrence of spontaneous chromosomal mutations

Porter

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1987

Genetica

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The iguanid lizard Sceloporus grammicus has a high level of karyotypic variability, and has often been cited as an example of chromosomal speciation. We examined a total of 2036 secondary spermatocytes from 30 S. grammicus males, and found that 16 of the 30 individuals (including a single lizard collected from a hybrid zone between two chromosome races) produced completely balanced spermatocytes. Fourteen of the 30 lizards (including both chromosomal heterozygotes and homozygotes) had relatively low (0.6% to 7.1°70) levels of aneuploidy. Heterozygotes had a 1.1°70 increase over homozygotes in the number of aneuploid spermatocytes observed. The frequency of aneuploidy in S. grammicus may not be high enough to cause chromosomal speciation by any of the mechanisms that have been proposed for this complex. Most individuals showed balanced segregation of the autosomal trivalents, but nearly half of the lizards had a significant excess of spermatocytes with the X 1 and X 2 rather than the Y sex chromosomes. Five lizards had spermatocytes which had fission mutations not found in the somatic cells. As many as 5.9o70 of the spermatocytes in one individual had chromosomal mutations. This chromosomal mutation rate has important implications for chromosomal evolution in S. grammicus.

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Evolution of Sceloporus grammicus complex (Sauria: Iguanidae) in central Mexico II. Studies on rates of nondisjunction and the occurrence of spontaneous chromosomal mutations

Porter

Sites

1987

Genetica

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New developments in vertebrate cytotaxonomy IV. Cytogenetic studies in reptiles

Peccinini-Seale

1981

Genetica

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High genetic variability of lizards of the sand-dwelling lacertid genus Acanthodactylus

Blanc

Cariou²

1980

Genetica

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HYBRIDIZATION OF KARYOTYPICALLY DIFFERENTIATED POPULATIONS IN THE SCELOPORUS GRAMMICUS COMPLEX (IGUANIDAE)

Cited by 84 publications

References 30 publications

Evolution of Sceloporus grammicus complex (Sauria: Iguanidae) in central Mexico II. Studies on rates of nondisjunction and the occurrence of spontaneous chromosomal mutations

Evolution of Sceloporus grammicus complex (Sauria: Iguanidae) in central Mexico II. Studies on rates of nondisjunction and the occurrence of spontaneous chromosomal mutations

New developments in vertebrate cytotaxonomy IV. Cytogenetic studies in reptiles

High genetic variability of lizards of the sand-dwelling lacertid genus Acanthodactylus

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