Question

if in triceratops, spikes on the tail are dominant to no spikes on the tail. what would be the f1 ratios of 2 heterozygous spiked triceratops?

Answer 1

The F1 generation ratios for a mating between two heterozygous spiked triceratops, where spiked tails are dominant, would yield a genotypic ratio of 1 TT (spiked):2 Ts (spiked):1 ss (no spikes) and a phenotypic ratio of 3:1, with three spiked to one no spikes.

Step-by-step explanation:

When two heterozygous spiked triceratops are mated, and spikes on the tail are dominant to no spikes, we expect to see Mendelian inheritance patterns. To determine the F1 generation ratios for this trait, we use a Punnett square to cross the genotypes Ts (spiked) with Ts (spiked). The resulting genotypic ratio for triceratops offspring with spiked tails to those without spikes will be:

• 1 TT (homozygous dominant, spiked)
• 2 Ts (heterozygous, spiked)
• 1 ss (homozygous recessive, no spikes)

This results in a phenotypic ratio of 3:1, with three spiked to one without spikes. We apply the same fundamental principles of inheritance that give rise to the 9:3:3:1 ratio in a dihybrid cross. However, since we are considering only one trait in this scenario, we see a monohybrid 3:1 ratio, characteristic of a cross involving a single dominant and recessive allele pair.