Inheritance is a fundamental concept in biology that explains how traits are passed from parents to offspring. This topic is covered in detail in the International Baccalaureate (IB) syllabus and includes various subtopics such as unlinked genes, gene linkage, dihybrid crosses, identifying recombinants, and the chi-squared test. Understanding these concepts is crucial for grasping the principles of genetics and evolution.
Unlinked genes are genes located on different chromosomes or far apart on the same chromosome, such that they assort independently during meiosis. This independent assortment follows Mendel's Second Law, which states that the inheritance of one trait does not affect the inheritance of another.
Consider two genes: one for seed shape (R for round, r for wrinkled) and one for seed color (Y for yellow, y for green). These genes are unlinked. A dihybrid cross between two heterozygous plants (RrYy) will produce offspring in a 9:3:3:1 phenotypic ratio.
Mendel's laws were derived from his experiments with pea plants, where he observed patterns in the inheritance of traits.
A dihybrid cross involves two pairs of contrasting traits. When analyzing these crosses, a Punnett square is used to predict the genotypic and phenotypic ratios of the offspring.
A cross between a heterozygous long-winged, black-bodied fruit fly (VvBb) and a short-winged, brown-bodied fly (vvBB) will produce offspring in the following ratio:
$$ \begin{array}{c|c|c|c|c} & vB & vB & vB & vB \ \hline Vb & VvBb & VvBb & VvBb & VvBb \ vb & vvBb & vvBb & vvBb & vvBb \ \end{array} $$
Predict the phenotype ratio of offspring from the cross mentioned above. The expected phenotypic ratio is 1:1:1:1 for long-winged black-bodied, long-winged brown-bodied, short-winged black-bodied, and short-winged brown-bodied flies.
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