Fill up the blanks by selecting the correct option.
In cross-breeding, ______ of one breed are mated with ________ of another breed.

Options

A. superior males, normal females
B. normal males, superior, superior females
C. normal males, normal females
D. superior males, superior females

Answer

To fill in the blanks in the statement "In cross-breeding, ______ of one breed are mated with ________ of another breed," we need to understand the concept of cross-breeding and the characteristics of the breeds involved.

1. **Understanding Cross-Breeding**: Cross-breeding is a method used to produce offspring by mating individuals from different breeds. The goal is to combine desirable traits from both breeds to create offspring that exhibit these traits.

2. **Identifying the Breeds**: In cross-breeding, it is important to select superior breeds for both the male and female. Superior breeds are those that possess desirable characteristics, such as better yield, disease resistance, or improved quality.

3. **Choosing the Correct Options**:
- The options provided are:
- A) superior males and normal females
- B) normal males and superior females
- C) normal males and normal females
- D) superior males and superior females
- Since the aim of cross-breeding is to enhance the traits of the offspring, the best choice would be to mate superior males with superior females.

4. **Final Answer**: Therefore, the correct completion of the statement is: "In cross-breeding, **superior males** of one breed are mated with **superior females** of another breed."