When white cat cross to black cat, F1 is white cat. F1 cats cross each other, and the proportion of white, black and brown cats in F2 is 9:3:4. What is the reason for this? ( )
A: Dominant epistasis
B: Additive effect
C: Recessive epistasis
D: Suppression
A: Dominant epistasis
B: Additive effect
C: Recessive epistasis
D: Suppression
举一反三
- 29． Lisa found_________according to(根据)Lost And Found． A．a blue and white cat B．a black and white case C．a black backpack D．a black and white cat
- ----- Is the cat white?--- Yes, it’s ____(the/a) white cat.
- One cat is black and white, the other is ________ black. A: solid B: eal C: one D: true
- 2. She lost a ________. A: small white cat B: cat small white C: white small cat
- The film is shot in black and white for the reason except that black and white ____________.