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finlep [7]
3 years ago
5

In one type of plant, orange petals (O) are dominant over yellow petals (o) and tall stems (T) are dominant over short stems (t)

. Complete a dihybrid cross for parents with the genotypes: OOTt × OoTt and answer the following in complete sentences.
Describe how you would set up a Punnett square for this cross.
List the likelihood of each possible offspring genotype.
List the likelihood of each possible offspring phenotype.
Biology
1 answer:
svet-max [94.6K]3 years ago
8 0
A Punnett square without interaction between genes is shown as follows:

          OT        Ot     OT       Ot
OT    OOTT  OOTt   OOTT  OOTt
oT     OoTT   OoTt   OoTT   OoTt
OT    OOTT  OOTt  OOTT   OOTt
ot      OoTt    Oott    OoTt     Oott

Summary: 
Genotype    probability      phenotype
OOTT          4/16 = 1/4      orange/tall
OOTt           4/16 = 1/4      orange/tall
OOtt            0/16 = 0         orange/short
OoTT          2/16  = 1/8      orange/tall
OoTt            4/16  = 1/4     orange/tall
Oott             2/16  = 1/8     orange/short
ooTT                        0        yellow/tall
ooTt                         0        yellow/tall
oott                          0        yellow/short
(Total                         1)

Therefore the phenotype distribution is as follows:
phenotype      probability
orange/tall      1/4+1/4+1/8 = 7/8
orange/short                          1/8
yellow/tall                               0
yellow/short                            0
(Total                                      1)
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