Correlations between relatives for acrocentric association frequency

1981 ◽  
Vol 59 (3) ◽  
Author(s):  
Moh-Ying Yip ◽  
DonaldP. Fox
Keyword(s):  
Association Frequency

Mathematical models for estimating preferential pairing and recombination in triploid hybrids

Genome ◽  
1988 ◽  
Vol 30 (5) ◽  
pp. 745-757 ◽  
Author(s):  
J. Sybenga
Keyword(s):  
Mathematical Models ◽  
Genetic Factors ◽  
Triploid Hybrid ◽  
Preferential Pairing ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Association Frequency ◽  
Ring Bivalents ◽  
Normal Pairing ◽  
Pairing Behaviour

Different mathematical models for estimating pairing and recombination parameters for triploid hybrids with two-armed chromosomes are discussed. In most models all information on preferential pairing is contained in the ratio of trivalents and ring bivalents and can be estimated independently of the chiasmate association frequencies in the two chromosome arms. The single degree of freedom available only permits the estimation of ranges of the three possible pairing relations between the three genomes. Alternatively, a single parameter can be estimated when additional assumptions are made. When the ratio r between the frequencies of trivalents and ring bivalents, independent of arm length differences and with a theoretical maximum of 2, is about 1, the ranges of the frequencies of the three pairing combinations are wide. When r becomes smaller than 1, very soon the ranges become limited to values where one of the three is relatively large and positive and the other two negative and varying between equal to very different, depending on slight changes in the first. When the frequency of open bivalents is relatively high and the frequency of univalents low, there most probably is a difference in chiasmate association frequency between the two arms of the average chromosome and this difference can be quantified. When the number of univalents is only slightly higher than expected on the basis of the number of open bivalents, the reason may be that (quantifiably) more chiasmata are formed after bivalent pairing than after trivalent pairing within certain ranges of r, and certain ranges of the average chiasmate association frequency. When the excess of univalents is larger, this is best explained by a failure of entire chromosomes to find each other. This degree of pairing failure can be estimated. All models have been applied to the triploid hybrid between allotetraploid Trifolium repens and diploid T. nigrescens. Assuming that the two genomes of T. repens do not pair, which cannot be demonstrated with certainty, the two genomes pair with the nigrescens genome with frequencies of 0.828 and 0.171, respectively. Introgression then occurs into either genome but not with the same frequency. If the repens genomes pair, this would be caused by either genetic factors disturbing the normal pairing behaviour or the absence of strict homologues. Then the relative pairing frequency between T. nigrescens and one of the T. repens genomes would be 0.838 and on an average 0.081 between the two other combinations, with a possibly considerable but unknown difference. The high average chiasmate arm association frequency (0.650) suggests that affinity between the pairing genomes is not very low. The average two arms do not differ in chiasma frequency.Key words: triploid hybrids, preferential pairing, recombination, mathematical models, Trifolium.

Association frequency and silver staining of nucleolus organizing regions in hyperthyroid patients

1980 ◽  
Vol 54 (1) ◽  
pp. 111-114 ◽  
Author(s):  
H. Zankl ◽  
C. Mayer ◽  
K. D. Zang
Keyword(s):  
Silver Staining ◽  
Association Frequency ◽  
Hyperthyroid Patients

Satellite-association frequency and rDNA content of a double-satellited chromosome

1976 ◽  
Vol 31 (1) ◽  
pp. 113-115 ◽  
Author(s):  
A. S. Henderson ◽  
K. C. Atwood
Keyword(s):  
Satellite Association ◽  
Association Frequency

scholarly journals Creating Financial Statements For Start-Ups

2020 ◽  
Vol 8 (1) ◽  
pp. 104-114
Author(s):  
Tanneru Anusha ◽  
Nedunuri Sushma ◽  
M B Sai Rohit ◽  
A Akhil
Keyword(s):  
Research And Development ◽  
Positive Association ◽  
Financial Statements ◽  
Financial Statement ◽  
High Tech ◽  
Stages Of Development ◽  
Association Frequency ◽  
Intangible Investments ◽  
Start Ups ◽  
Funding Level

This paper represents the sample of entrepreneurs who are in the process of starting a business. At investigates the determinants of financial projections and statements in start-ups. The predictions information in economics is consistent. There is a positive association frequency of financial statement preparation concerning the use of outside funding, level competition, and venture scale. There are alternative influences and suggestions that benefit in reducing competition and uncertainty in fundamental variations to prepare financial statements. For instance, cash statements are more important for start-ups, and frequency varies among different financial statements with products in earlier stages of development and with greater competition. In contrast to this financial statements projections and regular forecasts of sales by start-ups are positively associated with the importance of intangible investments such as parents, research, and development. The start-ups in high –tech industries are used for projections. 

Satellite association frequency and number of nucleoli depend on cell cycle duration and NOR-activity

1979 ◽  
Vol 50 (1) ◽  
pp. 81-91 ◽  
Author(s):  
J. Sigmund ◽  
H. G. Schwarzacher ◽  
A. V. Mikelsaar
Keyword(s):  
Cell Cycle ◽  
Cycle Duration ◽  
Satellite Association ◽  
Cell Cycle Duration ◽  
Association Frequency

Word-association frequency and the proximity effect

1964 ◽  
Vol 3 (4) ◽  
pp. 344-345 ◽  
Author(s):  
James G. Martin
Keyword(s):  
Proximity Effect ◽  
Word Association ◽  
Association Frequency

scholarly journals Effects of association, frequency, and stimulus quality on naming words in the presence or absence of pseudowords

1995 ◽  
Vol 23 (3) ◽  
pp. 289-300 ◽  
Author(s):  
Claudia Carello ◽  
Georgije Lukatela ◽  
Mira Peter ◽  
M. T. Turvey
Keyword(s):  
Stimulus Quality ◽  
Association Frequency
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