What is the theological basis both body and blood being present in both the eucharist host and the wine? (Catholic perspective) What is the theological basis for the conclusion that both species (body and blood) are fully present in both the transubstantiated wine and eucharist host?

This question is asked after learning that according to Catholic doctrine, either the consecrated host or the consecrated wine are by themselves perfectly sufficient for communion to be received. 

Please, only answers from a Catholic theological perspective.
1 Corinthians 11:27-29 forms the theological basis for the conclusion that under each of the species (bread and wine), the body and blood of Christ is fully present after transubstantiation.

That verse states that 'if anyone eats this bread or drinks this cup of the Lord unworthily, he will be held to account for the Lord’s body and blood.'

Here St. Paul attaches the same guilt "of the body and the blood of the Lord" (copulative) to the unworthy "eating or drinking" (disjunctive). 

In its article The Real Presence of Christ in the Eucharist, Catholic Encyclopedia points out that based on this verse Catholic Church believes that Jesus, in the species of bread alone, is fully present with his entire body, blood, soul and Divinity.