In peas, the gene for yellow color (C) is dominant over the gene for green color (c). To determine the genotype of an unknown yellow pea, what kind of pea should you cross with it?
Correct answer: D. Homozygous recessive (cc) or known heterozygous (Cc)
- A. Another unknown green pea
- B. Any genotype
- C. Homozygous dominant
- D. Homozygous recessive (cc) or known heterozygous (Cc)
Explanation
d) Homozygous recessive (cc) or known heterozygous (Cc) Explanation: This option is correct. To determine the genotype of an unknown yellow pea, the best choice is to cross it with either a homozygous recessive green pea (cc) or a known heterozygous yellow pea (Cc). If the unknown yellow pea is heterozygous (Cc), the cross with a homozygous recessive green pea (cc) will produce all yellow offspring. If the unknown yellow pea is homozygous dominant (CC), the cross with a known heterozygous yellow pea (Cc) will produce both yellow and green offspring, with a 1:1 phenotypic ratio.
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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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