MTTC 103 Elementary Practice Exam 2025 – Complete Study Guide

The most likely height distribution of the offspring from a cross of HH and hh plants is that all offspring will be 3 feet tall. In this genetic scenario, 'H' represents the dominant allele for height, and 'h' represents the recessive allele. The HH parent carries two dominant alleles, while the hh parent carries two recessive alleles.

When these two are crossed, each offspring will inherit one allele from each parent. The HH parent can only contribute 'H' alleles, while the hh parent can only contribute 'h' alleles. Therefore, all offspring will receive one 'H' from the HH parent and one 'h' from the hh parent, resulting in a genotype of Hh for every offspring.

Since 'H' is dominant, the presence of one dominant allele 'H' will determine the phenotype of the offspring, meaning all plants will exhibit the traits associated with the dominant allele. In this case, the height associated with the dominant alleles is 3 feet tall.

This leads to the conclusion that every offspring will be 3 feet tall, accurately reflecting the genetics involved in this cross.