In a laboratory, while working on a new species of fish, it is found that the fish has two varieties, red and brown. It was determined by another group of scientists in another laboratory that brown is a dominant color in this species. If we have brown fish with us in the laboratory, how can we determine whether they are homozygous or heterozygous for the trait?
Correct answer: A. Breed this fish with a redfish and check F1 generation
- A. Breed this fish with a redfish and check F1 generation
- B. Breed this fish with a redfish and check F2 generation
- C. Breed this fish with a brown fish and check F1 generation
- D. Breed this fish with a brown fish and check F2 generation
Explanation
To find out whether the given species is homozygous or heterozygous we should breed it with species having a recessive phenotype and check the first (F1) generation. If even one of the offsprings from the F1 generation have a recessive phenotype that means our species was heterozygous or else homozygous.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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