In a cross between two true-breeding lines for seed shape (round R_) and seed color (yellow Y_), which statement is true for the F1 generation?

A man with blood type A (genotype IAi) and a woman with blood type B (genotype IBi) have a child with blood type O. This could occur if:

X-linked disorders are located on the Y chromosome.

Which enzyme is primarily responsible for unwinding the DNA double helix during replication?

Which of the statements about the migration of cortical interneurons is CORRECT?

Which of the following is TRUE about the embryology of the central nervous system?

Which statement correctly describes the function of Ena/VASP proteins, which are anti-capping proteins?

Molecules that function as attractive guidance cues for axons growing in the nervous system are always secreted diffusible molecules, whereas repulsive guidance factors are typically bound to the ECM. True or false?

Which of the following is TRUE about apical radial glia?

In this experiment axons from nasal and temporal retina are plated on extracted cell membranes from anterior (a, black boxes) or posterior (p) tectum (white boxes). In some cases (marked with *) membranes are boiled before plating. What is the key finding from this experiment, and why?