NEET UG 2011 — Principles of Inheritance and Variation

When two unrelated individuals or lines are crossed, the performance of $F_1$ hybrid is often superior to both its parents. This phenomenon is called

Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child?

What will you look for to identity the sex of the following?

Mutations can be induced with

Test cross in plants of in Drosophila involves crossing

A person with unknown blood group under $A B O$ system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid certificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend?

Which one of the following conditions correctly describes the manner of determining the sex in the given example?