For a single(recessive) gene trait, a number of genetic disorders are caused when an individual inherits.
Correct answer: D. Two recessive alleles
- A. Two dominant alleles
- B. One dominant allele
- C. One recessive allele
- D. Two recessive alleles
Explanation
Option D is correct as genetic disorder that is recessive the person needs "two recessive alleles" otherwise the gene won't express itself in the phenotype.
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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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