White fur is dominant to black fur Steps:

• Heterozygous male is Ww (white, dominant); black females are ww (recessive).
• First black female (ww) × Ww male produces 5 black:2 white offspring, consistent with 1:1 ratio (Ww white, ww black) under sampling variation.
• Second black female (ww) × Ww male produces 9 black offspring, also consistent with 1:1 but all ww by chance.
• White offspring are Ww; thus, white male is Ww.
• White male (Ww) × heterozygous female (Ww) yields 1 WW white : 2 Ww white : 1 ww black. Why A is correct:
• Ww × Ww cross follows Mendel's law for a monohybrid with dominance, producing 3 dominant (white):1 recessive (black) phenotypic ratio. Why the others are wrong:
• B: Introduces unreported grey phenotype, violating problem's black/white dichotomy.
• C: Would occur if white male were ww recessive, but data indicate white offspring are heterozygous dominant.
• D: Applies to F2 cross with black dominant, not this scenario.

Final answer: A