In genetics, phenotypic variation across organisms is categorized based on distribution patterns, underlying gene architecture, and susceptibility to environmental influences. Match each biological trait on the left with its precise classification of genetic control and variation dynamics on the right.
- Total dermatoglyphic ridge count (fingerprint pattern complexity)Continuous variation exhibiting quantitative spectrum values governed by polygenic additive inheritance with high heritability and minimal post-developmental environmental alteration.
- ABO erythrocyte surface antigen specificityDiscontinuous variation governed by a single gene locus with multiple codominant and recessive alleles producing distinct, clear-cut physiological blood groups.
- Human epidermal melanin concentration gradientContinuous variation produced by multi-locus additive polygenes whose phenotypic expression is modified significantly by external environmental factors.
- Ability to roll the lateral margins of the tongue upwardDiscontinuous variation controlled by a single autosomal gene locus demonstrating simple Mendelian dominance with discrete, non-overlapping phenotypic classes.
Cevap
The correct pairings are: Total dermatoglyphic ridge count matches continuous polygenic variation with minimal environmental change; ABO erythrocyte antigen specificity matches discontinuous single-locus variation with codominant alleles; Human epidermal melanin concentration matches continuous polygenic variation influenced by external environment; Ability to roll tongue margins matches discontinuous single-locus variation with complete dominance.
Total dermatoglyphic ridge count forms a quantitative continuous spectrum under polygenic control with high embryonic heritability and no post-natal environmental modification. ABO blood group is a discontinuous trait determined by codominant single-locus alleles (). Skin melanin concentration shows continuous polygenic distribution enhanced by UV radiation. Tongue rolling is a simple monogenic discontinuous trait controlled by complete dominance.
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Anahtar Kavram
Polygenic vs Monogenic Inherited Variation and Environmental Plasticity