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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

Rescue of hybrid sterility in crosses between D. melanogaster and D. simulans

Article Abstract:

A strain of D. simulans which yields fertile female hybrids in crosses with D. melanogaster is hoped to elevate D. melanogaster genetics to the study of reproductive isolation and species differences. The C167.4 was confirmed to be a D. simulans strain by five criteria, namely, normal viability and fertility in crosses with three other D. simulans strains, inviability of hybrid males in crosses with D. melanogaster females, polytene chromosome banding pattern, the shape of the male genital arch and the presence of mariner, a transposable element in D. simulans.

Author: Ashburner, Michael, Sawamura, Kyoichi, Herrmann, Siegrun, Davis, Andrew W., Roote, John, Morley, Teresa
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996

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Endless forms, several powers

Article Abstract:

At a meeting held in California from 19-23 May, 1996, biologists presented data on genetic and evolutionary processes regulating speciation. Sympatric speciation by host shift results in up to 6% genetic differentiation per generation. Hybridization for environmental adaptation is the major force underlying the creation of new species in plants. Coevolution of sexual traits and male-male competition are the two common evolutionary processes that regulate animal speciation.

Author: Johnson, Norman A., Wu, Chung-I
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
Analysis, Conferences, meetings and seminars, Physiological aspects, Evolution (Biology), Origin of species, Sexual selection in animals, Sexual selection (Natural selection)

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A test of reciprocal X-Y interactions as a cause of hybrid sterility in Drosophila

Article Abstract:

Interaction between the X and Y sex chromosomes are not the sole or even the most frequent producer of sterility in hybrids. Experiments involving crosses of the sechellia and simulans species of the fly Drosophila failed to confirm the assumption that interactions between heterospecific X and Y are the only cause of hybrid sterility. Other mechanisms may influence the inability of hybrids to breed and thus to have any impact on evolution.

Author: Johnson, Norman A., Perez, Daniel E., Cabot, Eric L., Hollocher, Hope, Wu, Chung-I
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
Causes of, Sex chromosomes, Infertility in animals, Animal infertility

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Subjects list: Research, Genetic aspects, Drosophila, Hybridization
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