Question

The Punnett square below represents the result of the cross between two tall pea plants.
Part A: Identify the Genotypic and Phenotypic ratios of the offspring.

Part B: Identify two offspring from the Punnett square that could produce short pea plants if they were crossed. Explain your answer.

Answer 1

Answer:

this cross is monohybrid cross

part A...

genotypic ratio -- 1:2:1

phenotypic ratio--- 3:1

part B ...

to produce a dwarf pea plant by crossing offspring of f2gen.

1 . Tt × tt

2. Tt× Tt

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Answer 2

The Punnett square below represents the result of the cross between two tall pea plants.

Part A:  Ratios given below

Part B: Identify two offspring from the Punnett square that could produce short pea plants if they were crossed

Explanation:

Let us  understand the meaning of cross

It just refers to “mating of parents in order to form offspring .In these crosses we will get the  offspring  possessing different characters” .  

 Generally we make two types of crosses:  

• Monohybrid cross
• dihybrid cross

Monohybrid cross

It  is that in which two characters are studied at a time .

• Like we say, that we consider character height and obtain different results . As character is only one, that we are noticing therefore the cross is monohybrid .

 

Now lets understand the laws with monohybrid cross :

For example we consider feature : height

     tall                                                 dwarf  (parents )

       TT                                                   tt

      T,T                                                     t,t  (gametes )

                            Tt(all are tall )  

                       (   first generation  )      

Now, let us cross the first generation :

  Tt                                                           Tt   (parental generation )

    T,t                                                        T,t    (gametes )

 

To obtain F₂ generation , we make Punnett square :

          T      t  

T        TT     Tt

t         tT        tt

 F2 progeny:

• TT:Pure tall
• Tt: hybrid (tall )
• tt : Pure dwarf    

Phenotype :  It is the physical expression of an organism

tall: dwarf  

  3:1  

Genotype : It is the genetic constitution of an organism

TT : Tt : tt  

   1:2:1  

Now, in above asked question we have :

Part A : Ratios that are already given above .

Part B : That combinations are :

Tt × tt

 Tt× Tt