Provide a comprehensive answer to the following question.
1. What is a cross in which inheritance of two pairs of contrasting characters are studied?
A cross is a cross in which contrasting characters are inherited.
2. Name the conditions when both the alleles are identical?
In conditions, both alleles are .
a. The axial position of the flower is a recessive trait in garden pea plants.
b. The white flower is a recessive trait in garden pea plants.
c. The terminal position of the violet flower is a recessive trait in pea plants.
d. The violet colour of the flower is a dominant trait in pea plants.