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Q. What is recessive cross ? Explain with example.
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Fungi are useful for many other reasons.
They are a major source of citric acid (vitamin C).
They produce antibiotics such as penicillin, which has saved countless lives.
They can be genetically engineered to produce insulin and other human hormones.
They are model research organisms.
Example: Suppose you have a purple and white flower and purple color (P) is dominant to white (p). The white flower must be homozygous for the recessive allele, but the genotype of the purple flower is unknown. It could be either PP or Pp. A testcross will determine the organism's genotype. The unknown genotype can be determined by observing the phenotypes of the resulting offspring. If crossing the unknown dominant phenotype (PP or Pp genotype) individual with the recessive phenotype individual produces only dominant phenotypes (no recessive), then the unknown individual is homozygous dominant. If any recessive phenotypic individuals result from the cross, then the unknown individual must carry the recessive allele, and have the heterozygous genotype.
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→ When back cross is done with homozygous recessive parents then it is called recessive cross.
ex :- Tt × tt
→ Tt Tt. tt. tt
ratio of tall : dwarf is 1:1
Test cross is called test cross because genotype of individuals is tasted