Practice free Hereditary and Variation (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
What is the pattern of inheritance for polygenic trait?
Polygenic (quantitative) traits are controlled by many genes with additive effects and show a continuous, non-Mendelian inheritance pattern.
Genes R and Y follow independent assortment. If RRYY produce round yellow seeds and rryy produce wrinkled green seeds, what will be the phenotypic ratio of the F₂ generation?
A dihybrid cross with independent assortment gives the classic F₂ phenotypic ratio 9 : 3 : 3 : 1.
With the help of the given pedigree, find out the probability for the birth of a child having no disease and being a carrier (has the disease mutation in one allele of the gene) in F₃ generation.
The F₂ cross is between a carrier female (Aa) and an affected male (aa). Offspring are ½ Aa (unaffected carrier) : ½ aa (affected). The probability of an unaffected carrier child is 1/2.
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