Fertile hybrids in two genera of wallabies: Petrogale and Thylogale

Article Abstract:

Hybridization is common in marsupials, particularly in the rock wallabies, Petrogale. The genus presents an exceptional opportunity to study the effect of karyotypes on fertility by analysing synaptonemal complexes. A study describing the type of hybrids obtained from Petrogale and a closely related macropod species, Thylogale, is presented. It is demonstrated that fertile hybrids may result from differently genotyped and karyotyped parental species and the findings are consistent with Haldane's law.

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Cytoplasmically inherited albinism in peanut seedlings

Article Abstract:

Research was conducted on albinism in peanut seedlings. The seedlings came from selfing variegated peanut plants. Observations of F2 and F3 populations from three subspecific cultivar combinations of peanuts confirmed a 60:3 trigenic rato for nuclear albinos. Results revealed an independent cytoplasmic inheritance for albinism in peanut seedlings. The mode of inheritance due to gametic recombination was also determined.

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Morphological, cytogenetic, and molecular evidence for introgressive hybridization in birch

Article Abstract:

Research is presented concerning the use of a combined cytogenetic and morphological technique to investigate the extensive morphological variation which occurs in the Betula pubescens in Iceland. The hybridization of birch is discussed.

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