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
C
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 ____________.
内容
- 0
The film is shot in black and white for the reason that the use of black and white ____________.
- 1
Why is it considered bad luck to see a black cat crossing one's path? A: Because black cats look like witches. B: Because black cats were thought to be witches. C: Because black cats bring seven years of bad luck. D: Because black cats arc hard to notice in darkness.
- 2
(White and black) light, (if mixing) (in) the right proportion, (will show) us grey. A: White and black B: if mixing C: in D: will show
- 3
What color does it come _______? It comes in brown, white or black
- 4
Once you put the folk tale ______, it will be popular. A: in white and black B: in black and white C: by white and black D: by black and white