In a certain plant species, red flower colour (R) is dominant over white (r), and broad leaf shape (B) is dominant over narrow leaf shape (b). A plant exhibiting red flowers and broad leaves is self-pollinated. The resulting seeds are grown, producing the following progeny: - 120 plants with red flowers and broad leaves - 40 plants with white flowers and broad leaves Which of the following represents the correct geno

Step-by-step solution

The progeny exhibits a phenotypic ratio of 120 red, broad : 40 white, broad, which simplifies to 3:1 for flower colour and 1:0 for leaf shape. Since the flower colour segregates in a 3:1 ratio (red : white), the parent must be heterozygous for flower colour ( Rr ). Since all progeny have broad leaves and no narrow-leaved plants are produced, the parent must be homozygous dominant for leaf shape ( BB ). Therefore, the genotype of the self-pollinated parent is RrBB . Answer: RrBB