The Dominant Purple Flowers of Jimsonweed Plant

What color flowers are dominant in the Jimsonweed plant?

a) Purple
b) White
c) Pink
d) Blue

Answer:

Purple

The Jimsonweed plant exhibits dominant purple flowers. This dominance is reflected in genetic observations akin to Mendel's famous pea plant experiments. Dominant traits, such as purple flower color, are expressed when at least one dominant allele is present.

In the case of the Jimsonweed plant, purple flowers prevail over white flowers. The information provided indicates that only 25% of the plants feature white flowers, which correspond to the homozygous recessive genotype (bb). The remaining 75% display purple flowers due to the dominant purple factor (B) being present in either homozygous (BB) or heterozygous (Bb) form.

When conducting a Punnett square cross between a purple-flowered plant and a white-flowered plant, if the purple-flowered parent is homozygous dominant (BB), all offspring will exhibit the dominant purple flower trait. However, if the purple-flowered parent is heterozygous (Bb), approximately 50% of the offspring will be purple-flowered (Bb) and the other 50% will be white-flowered (bb). This exemplifies a fundamental principle of Mendelian inheritance, highlighting the dominance of the purple color trait in Jimsonweed plants.