Related Experiment Video
Updated: Jul 13, 2026
06:41
In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
Published on: August 20, 2019
Aposthia: a birth defect or normal quantitative recessive human genetic trait?
M Amin-Ud-Din1, A Salam, M A Rafiq
1Department of Biology, Government College, Dera Ghazi Khan, Pakistan. amin1158@hotmail.com
Summary
Aposthia, the absence of a foreskin, is typically sporadic. This study presents the first genetic profile of 3 families with this trait, exploring its potential genetic basis.
Area of Science:
- Medical Genetics
- Human Anatomy
Background:
- Aposthia, or natural circumcision, is the congenital absence of a prepuce.
- This condition is rarely documented, usually as isolated sporadic cases in medical literature.
Purpose of the Study:
- To investigate the genetic underpinnings of aposthia.
- To present the genetic profile of families exhibiting the aposthia trait.
Main Methods:
- Family-based genetic analysis.
- Pedigree documentation and genetic profiling.
Main Results:
- Detailed genetic profiles for three distinct families with aposthia were established.
- This marks the first presentation of familial genetic data for aposthia.
Conclusions:
- The study provides foundational genetic data for aposthia.
- Further research into the genetics of aposthia is warranted based on these familial findings.
More Related Videos
Related Concept Videos
01:35Pedigree Analysis
Overview
01:35Pedigree Analysis
Overview
01:11Genetic Lingo
Overview
01:09Epistasis Analysis
Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
01:43Incomplete Dominance
Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
01:19X-linked Traits
In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.