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47) Consider this dihybrid cross: TtRr x Ttrr T: tall plant; t: short plant; R: red...

47) Consider this dihybrid cross: TtRr x Ttrr

T: tall plant; t: short plant; R: red flowers; r: white flowers

What are the possible gametes?

  1. TR, Tr, tR, tr, and Tr, Tr, tr, tr
  2. TR, TR, TR, TR, and tr, tr, tr, tr
  3. Tr, rT, TT, rr, and Rr, TT, Tt, rr
  4. Rrrrrrrrrr and Tttttttt
  5. Tada!!!

48) In the dihybrid cross above (TtRr x Ttrr), how many offspring would be short with white flowers?

  1. 2
  2. 4
  3. 6
  4. 8
  5. 16

49) In the same dihybrid cross above (TtRr x Ttrr), how many offspring would have red flowers (tall and short plants combined)?

  1. 2
  2. 4
  3. 6
  4. 8
  5. 16

50) And finally, how many different phenotypes could result from the cross above (TtRr x Ttrr)?

  1. 2
  2. 4
  3. 6
  4. 8
  5. 16

Solutions

Expert Solution

Ans47)a)TR, Tr, tR, tr, and Tr, Tr, tr, tr

Ans48)a)2

Ans49)d)8

Ans50)b)4

Explaination:

Cross between TtRr xTtrr

P genotype:Tt Rr. x Tt rr

Gametes:TR,Tr,tR,tr. Tr, Tr, tr,tr

F1 progeny:

TTRr( Tall plants with red flower) TTRr(Tall plant with red flower,) TtRr(Tall plant with Red flower) TtRr(Tall with red flower)
TTrr(Tall plants with white flower) TTrr(Tall plant with white flower) Ttrr(Tall plant with white flower) Ttrr(tall plant with white flower)
TtRr((Tall plants with red flower) TtRr(Tall plant with red flower) ttRr (short plant with red flower) ttRr(short plant with red flower)
Ttrr (tall plant with white flower) Ttrr(Tall plant with white flower) ttrr (short plant with white flower) ttrr(short plant with white flowers)

There are four types phenotypes resulted in progeny of given cross :-

Phenotypic ratio:-

Tall plant with red flower: Tall plant with white flower : short plant with red flower : short plant with white flower (6:6:2:2).

There are 6 offspring that are tall with red flower.

There are 6 offspring that are tall with white flower

There are 2 offspring that are short with red flower

There are 2 offspring that are short with white flower

No of progeny with red flowers (combined tall and short plant) =6+2=8

gladiator answered 2 years ago
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