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#F1 progeny

2 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 ac

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

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Mendelian Inheritance

A test cross involves crossing F1 progeny with

Test cross by definition involves crossing F1 or any dominant phenotype individual of uncertain genotype with homozygous recessive parent, which carries two copies of recessive allele and can only produce recessive gametes. This homozygous recessive tester simplifies interpretation because any dominant progeny must have received dominant allele from tested parent, any recessive progeny recessive from both. Crossing with dominant, either or heterozygous parent would obscure analysis, not revealing gamete purity, hence recessive homozygote is standard tester. Cytological correlation with prophas

Ref: Griffiths et al., Introduction to Genetic Analysis, 12th ed., Chapter 2: Test Cross Definition

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