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The problem states that red flower color is represented by 'W' and white flower color by 'w'.

Biology

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Answers

2 parts
a

Pink\text{Pink}

b

Red, Pink, and White\text{Red, Pink, and White}

Step-by-step solution

2 steps

Step 1: Identify the alleles and their corresponding phenotypes.
The problem states that red flower color is represented by 'W' and white flower color by 'w'.
It also states that the heterozygous plant (Ww) is pink flowered. This indicates incomplete dominance.

Phenotypes and Genotypes:

  • Red flower: WW
  • Pink flower: Ww
  • White flower: ww

Part a

What will be the flower colour of the F1_1 generation?

The cross is between a red flowered plant and a white flowered plant.
Parental (P) genotypes: Red (WW) ×\times White (ww)

To find the F1_1 genotypes, we cross the parental genotypes:

P: WW×ww\text{P: WW} \times \text{ww}

Gametes from WW: W
Gametes from ww: w

F1:Ww\text{F}_1: \text{Ww}

All F1_1 individuals will have the genotype Ww. According to the problem, Ww results in a pink flower color.

The flower colour of the F1_1 generation will be: Pink\boxed{\text{Pink}}

Part b

Red, Pink, and White\text{Red, Pink, and White}

What will be the flower colour of the F2_2 generation after selfing F1_1?

The F1_1 generation consists of pink flowered plants (Ww). Selfing F1_1 means crossing F1_1 individuals with each other: Ww ×\times Ww.

  1. Perform the F1_1 self-cross (Ww ×\times Ww).

    We can use a Punnett square:

    Ww
    WWWWw
    wWwww

  2. Determine the genotypes and corresponding phenotypes for the F2_2 generation.

    From the Punnett square, the F2_2 genotypes are:

    • 1 WW
    • 2 Ww
    • 1 ww

    Now, match these genotypes to their phenotypes:

    • WW: Red flower
    • Ww: Pink flower
    • ww: White flower

    So, the F2_2 generation will have:

    • 1 Red flowered plant
    • 2 Pink flowered plants
    • 1 White flowered plant

    The flower colours of the F2_2 generation will be: Red, Pink, and White\boxed{\text{Red, Pink, and White}}

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