Concept explainers
To explain:
Occurrence in F3 generation of the curly-eared cat.
Introduction:
A cross that involves hybrids for a single trait is called a monohybrid cross. Punnett developed a method to predict the possible offspring of a cross between two known genotypes. It is easier to keep a track of the possible genotypes involved in a cross. Some traits are dominant while some are recessive.
Answer to Problem 17A
The curly- eared cat is produced in the F3 generation as well.
Explanation of Solution
In F2 generation three genotypes were produced; CC, Cc, cc in the ratio of 1:2:1. Now if they reproduce with cats that have non-curled ears; a F3 generation will have following combinations:
1. A CC catwith Cc − This cross will produce cats with all non-curled ears.
This can be checked by drawing a Punnett square as shown below.
C | C | |
C | CC | CC |
c | Cc | Cc |
2. A Cccat with Cc − This cross will produce cats in the ratio of 3:1 non-curled ears to curled ears.
This can be checked by drawing a Punnett square as shown below.
C | c | |
C | CC | Cc |
c | Cc | cc |
3. A cc cat with Cc − This cross will produce cats in the ratio of 1:1 non-curled ears to curled ears.
This can be checked by drawing a Punnett square as shown below.
c | c | |
C | Cc | Cc |
c | cc | cc |
Hence it can be concluded that the trait for curled ears was masked in some cats in F2 generation. This becomes clearly visible in F3 generation.
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Biology Illinois Edition (Glencoe Science)
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