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In general, most people prefer to marry those who are racially, ethnically, and culturally similar to themselves. That’s perfectly normal.  However, there are a minority who are adventurous and are attracted to people of different backgrounds. The Church nowhere prohibits this. What she insists upon is that both be Catholics wanting to raise children for Heaven. 
Genetic morality is something I’ve never heard about in any Church writing or anywhere else for that matter. Ones genes are not the source of morality. Did you invent the term, “genetic morality?” 

In general, most people prefer to marry those who are racially, ethnically, and culturally similar to themselves. That’s perfectly normal.  However, there are a minority who are adventurous and are attracted to people of different backgrounds. The Church nowhere prohibits this. What she insists upon is that both be Catholics wanting to raise children for Heaven.
Genetic morality is something I’ve never heard about in any Church writing or anywhere else for that matter. Ones genes are not the source of morality. Did you invent the term, “genetic morality?”

Would you like to answer this question: why in the world does the modern Liberal world, being influenced by the ʝʊdɛօ-Masonic-Marxist conspiracy, pursue racemixing as its ultimate goal (with racism being declared as the penultimate enemy rather than religion or something else)? How can Catholic priests and clergy just sit by and do nothing to this White Genocide being done through intermarriage? Furthermore, genetic morality refers to the moral duties that one has with regards to genetics problems. It does not state that "morality comes from genes". Also, it should be noted that for a very long time, the black slave trade was tolerated by the Catholic Church. Was that okay? I'm sure this issue has been discussed, but the texts have been censored and have been buried in obscure places, in order to protect some sort of peaceful coexistence.

Interracial marriage and immigration have a lot in common morally.

Immigration that is wise, just and limited is morally neutral, or positive. Unwise, unjust, and unlimited immigration bad for all involved.

The same parameters apply to interracial marriage.

The deleterious and degenerate forms of both are being used against the ethnic, and religious West. Not all attacks work against everyone, so all kinds of attacks are used. Some are involuntary like illegal immigration (and the resulting gang rape); some are voluntary, like abandoning your race, and culture and such in order to be inclusive or whatever. No means will go unused.

The morality of the actual begetting of the interracial children comes down to their own individual cases. Two smart, or beautiful people aren't guaranteed to have perfect children, or any children at all. It may be more likely that they will be good enough, but that doesn't help the one retarded child they have, or the one miscarriage. It may be more likely that certain combinations are worse than average, but that is not for society to police. We don't police white marriages that have more miscarriages than average, like some kind of three strikes rule.

When immigration is not out of all control, the admittance of immigrants is based on their individual cases. The same applies to the marriages.