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Andalusian fowls have two pure forms - black and white. If black forms (BB) and white forms (bb) are crossed, individuals appear blue coloured (Bb), due to incomplete dominance. Which of the following would be an outcome of a cross between black form and blue form?
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The correct answer is:
1 Black : 1 Blue
As Mendel, on crossing homozygous members for contrasting characters, the dominant trait is expressed in the heterozygous or hybrid condition. Incomplete dominance is a deviation of Mendels law of dominance where the heterozygous individual instead of expressing the dominant trait, it expresses a trait which is a mix of the parent traits. On crossing, black form fowl with white form fowl, the offspring is blue form.
When a black form fowl is crossed with blue form fowl we get-
Genotype of - BB and
Phenotype of - Black and Blue
When a black form fowl is crossed with blue form fowl we get-
| B | B | |
| B | BB | BB |
| b | Bb | Bb |
Genotype of - BB and
Phenotype of - Black and Blue
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