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#dominance

3 public questions tagged with this topic.

Mendelian Inheritance

A pure tall plant crossed with a dwarf plant produces all tall F1 progeny because

Pure tall genotype TT crossed with dwarf tt generates all heterozygous F1 Tt progeny. Tall phenotype predominates because tall allele is dominant, encoding functional product promoting gibberellin synthesis and internode elongation sufficient at single dose, while dwarf allele is recessive loss-of-function. Dwarf allele hidden in heterozygote, only expresses when homozygous tt. Tall recessive or dwarf dominant hypotheses predict opposite or mixed F1 phenotypes, linkage would cause distorted segregation not uniform tall, dominance concept explains observed all tall F1 result. Mastery ensures accurate interpretation of monohybrid and dihybrid progeny arrays, distinguishing dominance interactions from epistasis or linkage effects.

Ref: Griffiths et al., Introduction to Genetic Analysis, 12th ed., Chapter 2: Dominance Tall Pea

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Mendelian Inheritance

Dominance in Mendelian inheritance refers to

Dominance in Mendelian inheritance denotes allelic interaction wherein heterozygous phenotype mirrors one homozygous phenotype because one allele masks expression of another. Dominant allele often encodes functional protein sufficient at single dose, recessive allele may be loss-of-function or hypomorphic. Masking produces 3:1 ratio and explains why recessive traits skip generations. Both alleles expressing equally describes codominance such as AB blood group, blending suggests incomplete dominance, environmental effect unrelated to allele interaction at locus. Mastery ensures accurate interpretation of monohybrid and dihybrid progeny arrays, distinguishing dominance interactions from epistasis or linkage effects.

Ref: NCBI Bookshelf, Genetics, Chapter: Dominance and Recessiveness

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