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L Y Morgan

Publications and source records attributed to L Y Morgan.

5 recordsLinked to original sources
PubMed1982

Dermatoglyphics of hyperactive males.

In investigating the dermatoglyphics of hyperactive subjects, it was proposed that if similar hyperactives were sampled and significant differences were found from suitable controls, a genetic effect could be responsible. From two clinical populations, we ascertained 26 subjects in 24 sibships comprising the hyperactive study group. The control subjects came from an earlier study. Tables 2-9 contain summaries of the dermatoglyphic analyses of both subjects and controls. Data were grouped following a dermatoglyphic principle of complexity of pattern, specifically, and the number of triradii present. The scheme for reporting the results is: selection of the characteristic (pattern, ridge count); determination of the areas (digit, palm, sole); and comparison of the frequencies or counts in the two populations (hyperactives, controls). Among the 45 statistical tests, four achieved a 5% level of significance. Thus, with a seemingly homogeneous sample of hyperactive males and with criteria for comparisons, no characteristic dermatoglyphic features emerged. Considering the highly characteristic effects of chromosomal abnormality on dermatoglyphics as well as the features associated with an early intrauterine developmental disturbance, the lack of dermatoglyphic similarities in these hyperactive males reduces the likelihood of such a profound factor as a causal mechanism.

Attention Deficit Disorder with Hyperactivity↗
PubMed1980

The inheritance of digital dermatoglyphic patterns in 54 American Caucasian families.

We searched for single gene effects in determining digital patterns and compared with the evidence for monogenic determination in Israelis (Slatis et al., '76). Our subjects were 108 parents from central Louisiana and 123 of their offspring; there were 127 females and 104 males ranging in age from eight to 66 years. Arches on the thumb--Among 11 subjects, two were bilateral, and three pairs were related, two as parent-child and one as sib-sib; the findings support the concept of an incompletely penetrant dominant gene. Radial loops on the thumb--three occurred unilaterally in unrelated subjects. Ulnar loops (U) and whorls (W) on the thumb--Phenotype frequency was 104 UU, 65 UW, 47 WW, 15 other. The proportion of UU offspring was highest with both UU parents and diminished as the parents had increasingly more W, supporting the single locus hypothesis. Arches (A) on the fingers--71 A, 160 non-A showed a greater A frequency than in the Israelis. The proportion of A offspring was highest with both A parents and diminished as the parents became non-A. Sequence WWUWW--Among nine subjects, one was bilateral, two left, and six right; two pairs related as parent-child and sib-sib. Sequence WUUWW--Among five subjects, one was bilateral, and three were related as parent-offspring. Radial loops on index fingers--Frequency of 32% was greater than in the Israelis. Middle fingers--86% were U, 73% being bilateral. Radial loops on ring and little fingers--Among eight unilateral subjects, none was related. Ulnar loops and whorls on ring fingers--Proportion of UU offspring was greatest with both UU parents and diminished as parents became WW. We conclude that the Louisianians showed evidence for single gene effects similar to that of the Israelis.

Adolescent↗
PubMed1979

Digital dermatoglyphics of 107 Bengalis.

I analyzed the finger prints of 59 male and 48 female unrelated Bengalis in a rehabilitation camp of Dacca, Bangladesh. The most common pattern type in the Bengalis was the ulnar loop (53%), then whorls (40%); arches (5%) and radial loops (2%) were the least common. Radial loops occurred most frequently on the index fingers. I have shown the arch/whorl, whorl/loop, and pattern intensity indices, and I have presented ridge counts by individual digits and by total digital ridge count. Digital dermatoglyphics in the male Bangladeshis were similar to previous findings in male Brahmins of Bengal. However, there were more whorls and arches, fewer loops, and a higher mean total digital ridge count in the female Bangladeshis than in female Brahmins.

Bangladesh↗
PubMed1978

The inheritance of palmar and hallucal dermatoglyphic patterns in fifty-four American Caucasian families.

We searched for single gene effects determining certain palmar and plantar patterns - two interdigital and the hypothenar areas, palmar main line sequence, and hallucal pattern. Our subjects were 108 parents from central Louisiana and 123 of their offspring; there were 127 females and 104 males. For the third and fourth interdigital areas, we classified for presence of a pattern (+) or no pattern (-). For the hypothenar area, we classified arch, anteform, and open field as no pattern (-) and other configurations as a pattern (+). Main line sequence we determined by the distal to proximal ordering of the five main lines. We analyzed the hallucal area by combining three loop patterns. Segregational analyses followed. For the third interdigital area, the frequency of + was 51%. For the fourth interdigital area, the frequency of + was 45%. We set out the six mating types by the bilateral occurence of pattern in each area and found similar results. The proportion of ++ offspring was highest with both ++ parents and diminished as the parents became increasingly more --. Evidence for genetic determination of six different main line sequences consisted of the proportion of related/(related + unrelated) which averaged 0.48. Parent-offspring occurrence of an accessory triradius and absence of the c triradius suggested monogenic control. Segregation of the hallucal patterns was less suggestive. We conclude that the results offer evidence for substantial genetic determination of palmar dermatoglyphics, and for some patterns possible monogenic determination.

Adolescent↗