The molecular explanation for imprinting (as in the Igf2 gene) is that

What are chemical signals released by endocrine cells?

In a commensalism interaction, one species

In linkage studies, a test cross involves a cross between a double heterozygote and an individual that is homozygous recessive for both genes. Recombinant offspring are produced when a crossover occurs 

The binomial expansion equation is used to solve problems in which

When comparing the genome of a simple eukaryote, such as a yeast, to a complex eukaryote, such as a plant, why is the plant genome so much larger?

A change in chromosome structure that does not involve a change in the total amount of genetic material is

Radial symmetry is seen in a ________.  

With regard to a maternal effect gene, a mother is Dd and a haploid oocyte produced by the mother is d.  Which gene products would be found in this oocyte?

In animals, individual cells are grouped into ____________.