7. The petals of the plant Collinsia parviflora are normally blue, giving the sp

Question

7. The petals of the plant Collinsia parviflora are normally blue, giving the species its common name, blue-eyes Mary. Two pure breeding lines were obtained from color variants found in nature; the first line, line # had pink petals; the second line, line $ had white petals, and the third line & had normal blue petals. The following crosses were made between these pure lines, with the results shown below. Note that the parental lines are the same in each cross. For instance, the blue plant used in row 1 is the same blue plant used in row 2.

a. Explain these results genetically. Define the allele symbols you use, and show the genetic constitution of the parents, of the F1’s, and the F2’s by placing them in the appropriate location in the chart below.

Genetic explanation:

Define your symbols here:

7. The petals of the plant Collinsia parviflora are normally blue, giving the species its common name, blue-eyes Mary. Two pure breeding lines were obtained from color variants found in nature; the first line, line # had pink petals; the second line, line $ had white petals, and the third line & had normal blue petals. The following crosses were made between these pure lines, with the results shown below. Note that the parental lines are the same in each cross. For instance, the blue plant used in row 1 is the same blue plant used in row 2. a. Explain these results genetically. Define the allele symbols you use, and show the genetic constitution of the parents, of the F1?s, and the F2?s by placing them in the appropriate location in the chart below. Genetic explanation: Define your symbols here:

Explanation / Answer

All F1 CROSS---------------BLUE----------MEANS------------DOMINANT TRAIT

BLUE        ------OVER ------------------- PINK AND WHITE

Blue X White-----------F2------------------ 101 blue, 33 white------------3:1 RATIO----MONOHYBRID

Blue X Pink----------------F2-------------- 192 blue, 63 pink---------3:1 RATIO---- MONOHYBRID

Pink X White   ----------------F2--------------       272 blue, 121 white, 89 pink-----------THERE IS DEVIATION ----------9:4:3 ratio. DEVIATION FROM 9:3:3:1

=========================

CROSS 1 ---------         AABB X AAbb

Blue X White

P-------------        - AABB X AAbb                                        

F1 -----------   AABb (blue)   -ALL     OFFSPRING                                                  

F2----------------        ¾ BBAA (blue)                                                           

                        ¼ bbAA (white)

====================================

                CROSS 2

Blue X Pink

P------------      AABB X aaBB

            F1 ----------------         AaBB (blue) ----------ALL OFFSPRING

            F2----------------------    ¾ A_BB (blue)

-             ¼ aaBB (white)

======================================

CROSS 3

Pink X White

Pgen------------------                                                   aaBB X AAbb

F1     ----------------                                AaBb OFFSPRING

F2        -----------------------------                        9:4:3  

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