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monitta
3 years ago
10

In beta fish, green fish have the genotype CC, dark blue fish have the genotype cc, and green and blue spotted fish have genotyp

e Cc.Two green and blue spotted beta fish are crossed. What percentage of the offspring is expected to be green?
Biology
1 answer:
denpristay [2]3 years ago
4 0

Answer:

25%

Explanation:

This cross involves a single gene coding for spot color in beta fish. Green allele is C while the blue allele is c. This gene exhibits co-dominance, hence, an heterozygote beta fish (Cc) i.e. combination of both alleles, will have both phenotypes expressed to form a green and blue spotted beta fish.

If two green and blue spotted beta fishes (Cc) are crossed, each beta fish will produce gametes with C and c alleles. Using these gametes in a punnet square, four possible offsprings with the following genotypes will be produced: CC, Cc, Cc and cc.

C c

C CC Cc

c Cc cc

Hence, the percentage of offsprings expected to be green (CC genotype) is 1 out of 4possible offsprings i.e. 1/4 × 100 = 25%

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