For sneaky snakes, being rude (R) is dominant to being respectful (r). Complete the cross below, and determine the phenotype (dominant : recessive) ratio.
R r
r #1 #2
r #3 #4
2 (#5) : 2 (#6)
Column A Column B
a.rr
b.respectful
c. RR
d.sneaky
e.Rr
f.rude
g.sweet
1.blank #1
2.blank #2
3.blank #3
4.blank #4
5.blank #5
6.blank #6
To determine the phenotype (dominant : recessive) ratio, let's analyze the crosses:
1. When sneaky snakes (Rr) are crossed with respectful snakes (rr):
#1: Rr - This snake will be sneaky because being rude (R) is dominant to being respectful (r).
#2: Rr - This snake will also be sneaky for the same reason.
2. When respectful snakes (rr) are crossed with respectful snakes (rr):
#3: rr - This snake will be respectful.
#4: rr - This snake will also be respectful.
Therefore, the phenotype (dominant : recessive) ratio is:
Sneaky : Respectful
2 : 2
Matching the phenotypes to the corresponding columns:
Column A Column B
a.rr b.respectful
c.RR d.sneaky
e.Rr f.rude
g.sweet
1. Rr (sneaky) b. respectful
2. Rr (sneaky) b. respectful
3. rr (respectful) b. respectful
4. rr (respectful) b. respectful
5. (Blank) (Blank)
6. (Blank) (Blank)