Consider the following tetrahybrid cross between AaBbCCDD and AaBbCcDd. What pro
ID: 14382 • Letter: C
Question
Consider the following tetrahybrid cross between AaBbCCDD and AaBbCcDd. What proportion of the offspring will have the genotype A/A B/B C/C D/D?Explain why.
(a). 1/12
(b). 1/64
(c). 63/64
(d). 1/128
(e). 1/254
In the house plant Coleus, irregular venation is dominant to regular ventation. Suppost a plant with regular ventilation is crossed with a plant with irregular ventation that had as a parent a plant with regular ventation. What proportion of the offspring would have regular veins?
(a) All
B One-half
c On-third
D one-fourth
(e) None
Explanation / Answer
Consider the following tetrahybrid cross between AaBbCCDD and AaBbCcDd. What proportion of the offspring will have the genotype A/A B/B C/C D/D?
Explain why.
(a). 1/12
(b). 1/64
(c). 63/64
(d). 1/128
(e). 1/254
Aa Bb CC DD
A a B b C C D D
1/2 1/2 1 1
and
Aa Bb Cc Dd.
A a B b C c D d.
1/2 1/2 1/2 1/2
A/A B/B C/C D/D?
1/2 x1/2 1/2 x1/2 1 x1/2 1 x1/2
1/4 x1/4 x1/2 x1/2 =. 1/64
In the house plant Coleus, irregular venation is dominant to regular ventation. Suppost a plant with regular ventilation is crossed with a plant with irregular ventation that had as a parent a plant with regular ventation. What proportion of the offspring would have regular veins?
(a) All
B One-half
c On-third
D one-fourth
(e) None
irregular venation is dominant ------------R
regular ventation.------r
plant with regular ventilation is crossed with a plant with irregular ventation that had as a parent a plant with regular ventation
plant with regular ventilation---------rr
irregular ventation that had as a parent a plant with regular ventation----------Rr
r
r
R
Rr
irregular venation
Rr
irregular venation
r
rr
regular ventation
rr
regular ventation
50%
r
r
R
Rr
irregular venation
Rr
irregular venation
r
rr
regular ventation
rr
regular ventation