It is genetic and the child needs to get the gene from both parents to turn into a vegetable instead of a thinking child.
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	3	nsubj	3:nsubj	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	cop	3:cop	_
3	genetic	genetic	ADJ	JJ	Degree=Pos	0	root	0:root	_
4	and	and	CCONJ	CC	_	7	cc	7:cc	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	6:det	_
6	child	child	NOUN	NN	Number=Sing	7	nsubj	7:nsubj|9:nsubj:xsubj	_
7	needs	need	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	conj	3:conj:and	_
8	to	to	PART	TO	_	9	mark	9:mark	_
9	get	get	VERB	VB	VerbForm=Inf	7	xcomp	7:xcomp	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	11:det	_
11	gene	gene	NOUN	NN	Number=Sing	9	obj	9:obj|16:nsubj:xsubj	_
12	from	from	ADP	IN	_	14	case	14:case	_
13	both	both	DET	DT	_	14	det	14:det	_
14	parents	parent	NOUN	NNS	Number=Plur	9	obl	9:obl:from	_
15	to	to	PART	TO	_	16	mark	16:mark	_
16	turn	turn	VERB	VB	VerbForm=Inf	9	xcomp	9:xcomp	_
17	into	into	ADP	IN	_	19	case	19:case	_
18	a	a	DET	DT	Definite=Ind|PronType=Art	19	det	19:det	_
19	vegetable	vegetable	NOUN	NN	Number=Sing	16	obl	16:obl:into	_
20	instead	instead	ADV	RB	_	24	case	24:case	_
21	of	of	ADP	IN	_	20	fixed	20:fixed	_
22	a	a	DET	DT	Definite=Ind|PronType=Art	24	det	24:det	_
23	thinking	think	VERB	VBG	VerbForm=Ger	24	amod	24:amod	_
24	child	child	NOUN	NN	Number=Sing	9	obl	9:obl:instead_of	SpaceAfter=No
25	.	.	PUNCT	.	_	3	punct	3:punct	_
