A cytological and cytophotometric study of alternative pathways of meiosis in the house centipede (Scutigera forceps, rafinesque)

Ansley, Hudson R.

doi:10.1007/bf01259955

Cited by 50 publications

(12 citation statements)

References 27 publications

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“…Over the years desy napsis has been established as a gene mediated phenomenon in a large number of Gottschalk and Baquar 1971). Though the precise mode of action of these genes is not fully understood as yet, nevertheless, some attempts have been made to explain their effect through either imbalance in DNA: histone ratio (Ansley 1954) or inactivation of genetically controlled protein synthesis (Parchman andStern 1969, Jauhar andSingh 1969). Apart from genetic factors, extrinsic condi tions such as temperature and fertilizer quality has also been found to effect chromo some synapsis (Dhesi et al 1975, Rao 1975.…”

mentioning

confidence: 99%

Cytology of desynaptic Sternbergia fischeriana (Herb.) Roem. (Amaryllidaceae)

Karihaloo

Koul

1983

CYTOLOGIA

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mentioning

confidence: 99%

Cytology of desynaptic Sternbergia fischeriana (Herb.) Roem. (Amaryllidaceae)

Karihaloo

Koul

1983

CYTOLOGIA

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“…Hydrolysis in 1 N HC1 for 10 minutes gave optimum staining in both species. The cytophotometric determinations of the relative amount of DNA-Feulgen in individual nuclei were made with the apparatus and methods previously described (A~sLEY 1954).…”

Section: Methodsmentioning

confidence: 99%

Differential polyteny and polyploidy in diaspine coccids (Homoptera: Coccoidea)

Hughes‐Schrader

1956

Chromosoma

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“…The expression of sperm heteromorphism in animals varies (Table 3). Two general patterns occur; either all sperm morphs appear fertilization competent either because they have the appropriate haploid DNA content and/or are transferred to females (Ansley, 1954; Au et al. , 1998; Kubo‐Irie et al.…”

Section: Animalsmentioning

confidence: 99%

Pollen and sperm heteromorphism: convergence across kingdoms?

Till–Bottraud

Joly

Lachaise

et al. 2005

J of Evolutionary Biology

102

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Sperm competition theory predicts that males should produce many, similar sperm. However, in some species of animals and plants, males exhibit a heteromorphism that results in the production of at least two different types of sperm or pollen grains. In animals, sperm heteromorphism typically corresponds to the production of one fertile morph and one (or more) sterile morph(s), whereas in plants two or more pollen morphs (one of which can be either sterile or fertile) are produced in all flowers but sometimes in different anthers. Heteromorphism has arisen independently several times across phyla and at different phylogenetic levels. Here, we compare and contrast sperm and pollen heteromorphism and discuss the evolutionary hypotheses suggested to explain heteromorphism in these taxa. These hypotheses include facilitation, nutritive contribution, blocking, cheap filler, sperm flushing or killing for animals; outcrossing and precise cross‐pollen transfer or bet‐hedging strategy for plants; cryptic female choice for both. We conclude that heteromorphism in the two phyla is most likely linked to a general evolutionary response to sexual selection, either to increase one male's sperm or pollen success in competition with other males, or mediate male/female interactions. Therefore, although sperm and pollen are not homologous, we suggest that heteromorphism represents an example of convergence across kingdoms.

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A cytological and cytophotometric study of alternative pathways of meiosis in the house centipede (Scutigera forceps, rafinesque)

Cited by 50 publications

References 27 publications

Cytology of desynaptic Sternbergia fischeriana (Herb.) Roem. (Amaryllidaceae)

Cytology of desynaptic Sternbergia fischeriana (Herb.) Roem. (Amaryllidaceae)

Differential polyteny and polyploidy in diaspine coccids (Homoptera: Coccoidea)

Pollen and sperm heteromorphism: convergence across kingdoms?

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