PATHOLOGY

Detailed explanation-1: -In pea plants, tall (T) plants are dominant over short (t) plants. Complete the following crosses and give the genotypic and phenotypic ratios of offspring. 2. In pea plants, purple flowers (P) are dominant over white (p) flowers.

Detailed explanation-2: -In peas, the trait for tall plants is dominant (T) and the trait for short plants is recessive (t). The trait for yellow seeds is dominant (Y) and the trait for green seeds is recessive (y). A cross between two plants results in 292 tall yellow plants and 103 short green plants.

Detailed explanation-3: -As shown in the figure a cross between two heterozygous tall plants results in 25% homozygous tall, 50% heterozygous tall and 25% dwarf plants. Thus the correct answer is option C.

Detailed explanation-4: -When the two plants with different alleles TT and tt are crossed, one allele from each parent descends to the gametes and the offspring becomes Tt in genotype. As the dominant allele T is present, the offspring will be tall in phenotype. The correct is option (A), Tallness is the dominant trait.