Consider the following hypothetical pathway: H allele converts X substance to H substance h allele cannot convert X to H substance and leads to phenotype ‘O’ A allele converts H […]
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CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
Genetic pathway problem
17. Following is a hypothetical biochemical pathway responsible for pigmentation of leaves. The pathway is controlled by two independently assorting genes ‘A’ and ‘B’ encoding enzymes as shown below. Mutant […]
CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
Labrador Coat Colour Genetics: Why a 9 Black : 3 Brown : 4 Yellow Ratio Shows Recessive Epistasis
16. A black Labrador homozygous for the dominant alleles (BBEE) is crossed with a yellow Labrador homozygous for the recessive alleles (bbee). On intercrossing the F1, the F2 progeny was […]
CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
Predicting Red and White Flower Ratios in Pea Plants
15. Two plants with white flowers are crossed. White flowers arise due to recessive mutation. All F1 progeny have red flowers. When the F1 plants are selfed, both red and […]
CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
Chi-square test for a 15:1 ratio when two duplicate genes control a dominant trait
14. A plant heterozygous for a dominant trait was selfed. The progeny had 140 plants showing the dominant trait and 20 plants showing the recessive trait. A researcher hypothesised that […]
CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
Understanding Recessive Epistasis and Chi-Square Test in Fruit Color Genetics
13. A plant with red fruit is crossed to a plant with white fruit. The F1 progeny had red fruits. On selfing the F1 two kinds of progeny were observed, […]
CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
Understanding F2 Progeny Ratios in Two Interacting Genes Affecting Pathway End Product
12. Two interacting genes (independently assorting) were involved in the same pathway. Absence of either genes function leads to absence of the end product of the pathway. A dihybrid cross […]
CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
Biochemical Pathway Genetics in Sweet Pea
The following is the biochemical pathway for purple pigment production in flowers of sweet pea: Recessive mutation of either gene A or B leads to the formation of white flowers. […]
CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
How to Interpret the 9:7 Flower Color Ratio in Pea Plants
10. When two independent pure lines of pea with white flowers are crossed, the F1 progeny has purple flowers. The progeny obtained on selfing shows both pruple and white flower […]
CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES
9:7 ratio and complementation between two white-flower mutants
9. Two mutant plants, both bearing white flowers, were crossed. All F1 plants had red coloured flowers. When an F1 plant was selfed it produced progeny with either red or […]
