Which statement about Down syndrome is true? A. Trisomy of chromosome 21 is well tolerated enough to give rise to fully‑developed individuals. B. The probability of a child having Down syndrome does not correlate with maternal age. C. The primary cause for Down syndrome is the Robertsonian translocation. D. Down syndrome never runs in the family, as it is based on a random aneuploidy event.

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explanation:

the father in the first generation probably had the recessive colorblind trait in his x chromosome. if he and his wife both had the colorblind trait, even if she had 1 recessive and 1 dominant, then that trait would be passed on to their kids.

(since you didn't attach the family tree this is just an assumption)

the answer is otpion c) understanding

he wants to be heard one more time. he wants to be understood. he needs the truth one more time.