Flowering gene Ppd in pea: map position and disturbed segregation of allele ppd-2

Article Abstract:

The flowering genes Sn, Ppd and Dne contribute to the pea's ability to respond to photoperiod. A weak linkage has been found between ppd and the anthocyanin gene alpha in group IA but the map position remains undetermined. A new study shows that flowering gene ppd in pea (Pisum sativum L.) is located between the isozyme locus Aatp (asparate aminotransferase) and the branching gene rms3. Evidence suggests that the presence of both ppd and mutant ppd gene, known as ppd-2, which causes early flowering, results in selection against male gametes carrying the ppd-2 allele.

Pea, Plant genetics, Plants, Flowering of, Plant flowering, Peas

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Inheritance of body pigmentation pattern in Brachydanio rerio

Article Abstract:

Mating experiments between zebra danios have generated offspring with spots instead of stripes. The spotted danios, which were called leopard danios, matched zebra danios in all features except for body pigmentation patterns. Tests of the body pigmentation patterns in both danio types showed the formation of a single autosomal locus, the striped pigmentation pattern, S, dominated the spotted allele s.

Animal pigments, Danio

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Stable association of a pigmentation allele with an oncogene: nonhybrid melanomas in Xiphophorus variatus

Article Abstract:

The hybrid fish genus Xiphophorus system is used to determine the genetic characteristics of melanoma disease. Melanoma level is indicated by oncogene regulation by tumor suppressors. The disease is generated by Xmrk overexpression, which is conditioned by the accumulation of mutational damage. Thus, P2 exhibited better predictors of melanoma in non-familial etiology than the classic hybrid system.

Cancer, Cancer genetics, Melanoma, Xiphophorus

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