IGCSE Biology Paper-4: Specimen Questions with Answers 223 - 224 of 279

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Passage

Flowers from three red-flowered plants, A, B and C, of the same species were self-pollinated.

Question 223 (3 of 5 Based on Passage)

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Short Answer▾
The Seeds Were Germinated Separately and Could Grow and Produce Flowers. The Color of These Flowers is Shown in the Table
seeds from plantcolor of flowers grown from the seeds
Aall red
Bsome red and some white
Csome red and some white

The seeds were germinated separately and could grow and produce flowers. The color of these flowers is shown in the table.

Seeds were collected from plants A, B and C.

State which plant, A, B, or C, produced seeds that were homozygous for flower color.

Explanation

RR genotype will show red flower.

rr genotype will show white flower.

Question 224 (4 of 5 Based on Passage)

Write in Short

Short Answer▾

Seeds were collected from plants A, B and C.

The seeds were germinated separately and could grow and produce flowers. The color of these flowers is shown in the table.

The Seeds Were Germinated Separately and Could Grow and Produce Flowers. The Color of These Flowers is Shown in the Table
seeds from plantcolor of flowers grown from the seeds
Aall red
Bsome red and some white
Csome red and some white

State the recessive allele for flower color.

Explanation

Rr Alleles for White Color

Recessive factor or allele: The factor of an allelic or allelomorphic pair which is unable to express its effect in the presence of its contrasting factor in heterozygous state is called recessive factor or allele. A recessive allele is represented by small letter. e. g. r in Rr. The effect of recessive factor becomes known only when it is present in the pure or homozygous state, e. g. rr in white color plant.

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