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प्रश्न
How are Mendelian inheritance, polygenic inheritance and pleiotropy different from each other?
उत्तर
Mendelian inheritance refers to the expression of monogenic traits, i.e. gene expression is controlled by one gene. In a pair of alleles, an expression of the recessive gene is always masked by the expression of a dominant gene. The ability of a gene to have multiple phenotypic effects because it influences several characters simultaneously is called pleiotropy. It is due to the effect of the gene on two or more inter-related metabolic pathways which contributes to the formation of different phenotypes.
Polygenic inheritance is a type of inheritance controlled by one or more genes in which the dominant alleles have a cumulative effect with each dominant allele expressing a part or unit of the trait, the full being shown only when all the dominant alleles are present.
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संबंधित प्रश्न
A cross was carried out between two pea plants showing the contrasting traits of height of the plants. The result of the cross showed 50% parental characters.
(i) Work out the cross with the help of a Punnett square.
(ii) Name the type of the cross carried out.
In a cross between two tall pea plants some of the offsprings produced were dwarf. Show with the help of Punett square how this is possible.
A garden pea plant (A) produced inflated yellow pod, and another plant (B) of the same species produced constricted green pods. Identify the dominant traits.
How would you find genotype of a tall pea plant bearing white flowers? Explain with the help of a cross. Name the type of cross you would use.
A teacher wants his/her students to find the genotype of pea plants bearing purple coloured flowers in their school garden. Name and explain the cross that will make it possible
A plant of F1 generation has genotype “AABbCC”. On selfing of this plant, the phenotypic ratio in F2 generation will be ______.
______ is a type of trait whose phenotype is influenced by more than one gene.
For the expression of traits genes provide only the potentiality and the environment provides the opportunity. Comment on the veracity of the statement.
A, B, D are three independently assorting genes with their recessive alleles a, b, d respectively. A cross was made between individuals of Aa bb DD genotype with aa bb dd. Explain the type of genotypes of the offspring produced.
The pedigree chart given below represents the pattern of inheritance of thalassemia in a family.
What could be the genotype of the affected male?
