What is the result of a cross of a heterozygous curly winged fly to a straight-winged fly? (Include both genotype and phenotype with fractions of each)
Do I need to make a monohybrid cross or a dihybrid cross?
If only two alleles of one gene are involved, it would be monohybrid. Since curly-winged is heterozygous, curly would be dominant, Cs. Assuming straight-winged is homozygous, ss.
Take it from there.
To determine the result of a cross between a heterozygous curly-winged fly and a straight-winged fly, you would need to perform a monohybrid cross. A monohybrid cross involves studying the inheritance of a single trait and can be used to determine both the genotype (genetic makeup) and phenotype (observable characteristic) of the offspring.
In this case, the curly wing trait is likely dominant and is represented by the letter "C," while the straight wing trait is recessive and is represented by the letter "c." The heterozygous curly-winged fly would have the genotype Cc, indicating that it carries one dominant curly wing allele and one recessive straight wing allele. The straight-winged fly would be homozygous recessive and have a genotype of cc, carrying two recessive alleles for straight wings.
When we cross the heterozygous curly-winged fly (Cc) with the straight-winged fly (cc), we can use Punnett squares to predict the possible genotypes and phenotypes of the offspring.
Constructing a Punnett square, we take the alleles from each parent and place them along the top and side of the square:
C c
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c | Cc | cc |
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Next, we combine the alleles in each square of the Punnett square:
C c
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c | Cc | cc |
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The Punnett square shows us that, on average, 50 percent of the offspring will have the genotype Cc (heterozygous for curly wings), and the other 50 percent will have the genotype cc (homozygous for straight wings).
Considering the phenotypes, the curly-winged phenotype is dominant, while the straight-winged phenotype is recessive. Therefore, the predicted phenotypic ratio will be 1:1, meaning that 50 percent of the offspring will have curly wings, while the other 50 percent will have straight wings.