Assuming that the three genes undergo independent assortment, predict the phenotypic ratio of the in the f2 generation. in a cross between these two plants (mmddpp x mmddpp), all offspring in the f1 generation are wild type and heterozygous for all three traits (mmddpp). now suppose you perform a testcross on one of the f1 plants (mmddpp x mmddpp). the f2 generation can include plants with these

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A wild-type tomato plant (Plant 1) is homozygous dominant for three traits: solid leaves (MM),normal height (DD), and smooth skin (PP).Another tomato plant (Plant 2) is homozygous recessive for the same three traits: mottled leaves (mm), dwarf height(dd), and peach skin (pp). (image 1)

As you can see in the Punett square presented below (image 2)                      in the                               F2             MmDdPp x mmddpp cross you get 8 phenotypes:

solid, normal, smooth  (MmDdPp genotype)

solid, normal, peach   (MmDdpp genotype)

solid, dwarf, smooth    (MmddPp genotype)

solid, dwarf, peach      (Mmddpp genotype)

mottled, normal, smooth  (mmDdPp genotype)

mottled, normal, peach   (mmDdpp genotype)  

mottled, dwarf, smooth    (mmDdPp genotype)

mottled, dwarf, peach     (mmddpp genotype)

In this type of cross between MmDdPp and mmddpp, the phenotypic ratios in the eight possible phenotypes are as follow; a. solid, normal, smooth = 1:8

b. solid, normal, peach = 1:8

c. solid, dwarf, smooth = 1:8

d. solid, dwarf, peach = 1:8

e. mottled, normal, smooth = 1:8

f. mottled, normal, peach = 1:8

g. mottled, dwarf, smooth = 1:8

h. mottled, dwarf, peach = 1:8

Explanation: The number of gametes that can be formed from a particular genotype is given as 2^n where n is the number of heterozygous loci. In the genotype MmDdPp, n = 3. Therefore, 8 gametes can be formed.

In genotype mmddpp, n = 0. Therefore, only one type of gamete can be formed.

Crossing the two genotype (MmDdPp and mmddpp) as shown in the attached image, 8 possible offsprings can be achieved. Phenotypes of these offspring had been stated earlier. The phenotypic frequency of each of these offspring is one out of eight (⅛).

There are 8 distinct phenotypes, each one has a 12,5% of appearance:

Since M=solid leaves D=normal height P= smooth skin.

Recessive traits can only be observed in homozygous recessive mmddpp.

1.MmDdPp: M=solid leaves D=normal height P= smooth skin.

2.MmDdpp M=solid leaves D=normal height pp= peach skin.

3.MmddPp M=solid leaves dd=dwarf height P= smooth skin.

4.Mmddpp M=solid leaves dd=dwarf height pp= peach skin.

5.mmDdPp mm=mottled leaves D=normal height P= smooth skin.

6.mmDdpp mm=mottled leaves D=normal height pp= peach skin.

7.mmddPp mm=mottled leaves dd=dwarf height P= smooth skin.

8.mmddpp mm=mottled leaves dd=dwarf height pp= peach skin.

solid leaves (MM),

normal height (DD),

smooth skin (PP).

recessive TRAITS

leaves (mm),

dwarf height

(dd), and

peach skin (pp)

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