A scientist has discovered a new species of flower in which purple coloration is dominant to white. He wishes to know the genotype of a specific purple flower. Which of the following crosses would give him a definitive answer for the purple flower genotype?
Correct answer: C. Unknown purple X White
- A. Unknown purple X Homozygous purple
- B. Unknown purple X Unknown Purple
- C. Unknown purple X White
- D. None of these
Explanation
This option can result in: Either a 1:1 ratio of purple and white flowers. The unknown purple flower would be heterozygous. OR All purple flowers. The unknown purple flower would be homozygous. Thus option C can give a definite answer.
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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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