As a result of the monohybrid cross Mendel got:
Correct answer: C. 75% round
- A. 25% round
- B. 50% round
- C. 75% round
- D. 100% round
Explanation
As a result of his monohybrid cross experiments, Gregor Mendel observed the following: Law of Segregation: Mendel found that the offspring of his monohybrid crosses exhibited a 3:1 phenotypic ratio in the first generation (F1). This ratio indicated that one trait was dominant and the other was recessive. The dominant trait appeared in the majority (3/4) of the offspring, while the recessive trait appeared in the minority (1/4) of the offspring. Genotypic Ratios: Mendel also observed a 1:2:1 genotypic ratio in the second generation (F2) of his monohybrid crosses. This ratio indicated that the offspring inherited one allele from each parent, with three possible genotypes: homozygous dominant (AA), heterozygous (Aa), and homozygous recessive (aa). Principle of Independent Assortment: In addition to the monohybrid crosses, Mendel performed dihybrid crosses to study the inheritance of two different traits. He observed that the alleles for different traits segregated independently during gamete formation, demonstrating the principle of independent assortment. Overall, Mendel's monohybrid crosses provided evidence for the existence of discrete heritable units (genes), the segregation of alleles during gamete formation, and the presence of dominant and recessive traits. His findings laid the foundation for the principles of inheritance and became the basis for modern genetics. An explanation is given below:
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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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