Introduction:
According to
Answer to Problem 15A
Correct answer :
The correct answer is option C. 1:2:1 red: purple: white
Explanation of Solution
Explanation/justification for the correct answer:
Option C. 1:2:1 red: purple: white−A purple radish ( Rr ) is produced by a cross between red ( RR ) and white ( rr ) radish plants due to incomplete dominance.
A Rr radish plant will produce two types of gametes- male and female- each with either the R allele or r allele. If a purple radish ( Rr ) is crossed with another purple radish ( Rr ), there are three possible genotypes; RR, Rr and rr . So the resulting phenotypic ratio will be 1: 2:1 red: purple: white as 1 red, 2 purple and 1 white radishes will be produced.
This can be checked by drawing a Punnett square as shown below.
R | r | |
R | RR | Rr |
r | Rr | rr |
Hence this is the correct option.
Explanation for incorrect answer:
Option A. 2:2 red: white- When two heterozygous plants of radish are crossed, the following phenotypes are produced. So the resulting phenotypic ratio is 1: 2:1 red: purple: white as 1 red, 2 purple and 1 white radishes are produced.
R | r | |
R | RR | Rr |
r | Rr | rr |
Hence this is not the correct option.
Option B. 1:1:1 red: purple: white- When two heterozygous plants of radish are crossed, the following phenotypes are produced. So the resulting phenotypic ratio is 1: 2:1 red: purple: white as 1 red, 2 purple and 1 white radishes are produced.
R | r | |
R | RR | Rr |
r | Rr | rr |
Hence this is not the correct option.
Option D. 3:1 red: white- When two heterozygous plants of radish are crossed, the following phenotypes are produced. So the resulting phenotypic ratio is 1: 2:1 red: purple: white as 1 red, 2 purple and 1 white radishes are produced.
R | r | |
R | RR | Rr |
r | Rr | rr |
Hence this is not the correct option.
Chapter 11 Solutions
Biology Illinois Edition (Glencoe Science)
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