Question

Explain how two parents who do not have Morquio syndrome can give birth to a child who does have morquio syndrome.

Answer 1

Morquio A syndrome is a recessive disorder, hence it requires that a person has 2 "broken alleles" in order to have it

Step-by-step explanation:

Every one has 2 versions (alleles) for every gene/trait. Now if someone with Morquio has to have 2 broken alleles (which they do), then that means they'd have to inherit one from their mom, and one from their dad. Each of the parents don't have to have Morquio, instead they can be healthy caregivers.

Side note; people with Morquio will 100% pass down one of their broken alleles since they only have a broken allele to give.

Extra note; feel free to ask any & all questions about Morquio Syndrome

Signed,
a Morquio expert

Answer 2

Morquio syndrome is a rare inherited birth defect that occurs in one of every 200,000 births. Morquio syndrome is a genetic disorder, and it results from mutations of two specific genes: GALNS and GLB1. 2 Primarily, these are involved in the production of enzymes that digest larger sugar molecules called glycosaminoglycans (GAGs).

The grandparents may have had it..? Sorry it's not what you're looking for. Hope it helps tho