If the alleles for a trait did not segregate during gamete formation, offspring would always show the trait of at least one of the parents

The answer is: true.

Usually, a diploid organism has a pair of alleles for a certain trait and each parent passes one of these randomly to its offspring. This is known as Mendel’s law of segregation. Alleles separate so that each gamete receives only one allele.

So, if they don’t separate during meiosis, offspring will show the trait of at least one of the parent.

clinically, some people often have repeated allergies, eczema and respiratory infections or other parts of the infection, in this case, in addition to some routine tests such as tests for white blood cells, immunoglobulin series, lymphocyte subsets, etc., the five immune immunoglobulin tests are also necessary.