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A gene that exhibits multiple phenotypic expressions is known as a:
The NCERT text defines this: 'There are however instances where a single gene can exhibit multiple phenotypic expression. Such a gene is called a pleiotropic gene.'
What is the underlying mechanism for pleiotropy in most cases?
The NCERT text explains: 'The underlying mechanism of pleiotropy in most cases is the effect of a gene on metabolic pathways which contribute towards different phenotypes.'
Human height is an example of a trait that:
The text states: 'For example, in humans we don’t just have tall or short people as two distinct alternatives but a whole range of possible heights. Such traits are generally controlled by three or more genes and are thus called as polygenic traits.'
In polygenic inheritance, if three genes (A, B, C) control a trait, and each dominant allele contributes equally to the phenotype, how many dominant alleles would an individual with an intermediate phenotype likely possess if AABBCC results in the darkest phenotype and aabbcc results in the lightest?
The NCERT text says: 'As expected the genotype with three dominant alleles and three recessive alleles would have an intermediate skin colour.' An individual with three dominant alleles (e.g., AaBbCc) would have an intermediate phenotype.
Which of the following conditions is an example of a disease caused by pleiotropy?
The NCERT text explicitly mentions: 'An example of this is the disease phenylketonuria, which occurs in' (the sentence is cut off, but it's clearly stated as an example of pleiotropy).
The effect of each allele in polygenic inheritance is considered to be:
The NCERT text states: 'In a polygenic trait the phenotype reflects the contribution of each allele, i.e., the effect of each allele is additive.'
Mendel's studies focused on traits with distinct alternate forms. Which of the following is NOT a distinct alternate form mentioned in the context of Mendel's work?
Mendel's traits were distinct, like 'flower colour which are either purple or white.' Human skin color is presented as an example of a trait that is 'not so distinct in their occurrence and are spread across a gradient,' which is characteristic of polygenic inheritance, not Mendelian distinct traits.
Polygenic inheritance differs from Mendelian monohybrid inheritance in that polygenic inheritance:
The NCERT text specifies that 'Besides the involvement of multiple genes polygenic inheritance also takes into account the influence of environment.' Mendelian traits, as discussed, are generally distinct and do not explicitly highlight environmental influence in the same way.
Which statement accurately defines polygenic inheritance?
The NCERT text states: 'Such traits are generally controlled by three or more genes and are thus called as polygenic traits. Besides the involvement of multiple genes polygenic inheritance also takes into account the influence of environment. ... in humans we don’t just have tall or short people as two distinct alternatives but a whole range of possible heights.'
If an individual has the genotype AaBbCc for skin color (where A, B, C contribute to darker skin), what type of skin color would they likely have?
The NCERT text indicates: 'As expected the genotype with three dominant alleles and three recessive alleles will have an intermediate skin colour.' The genotype AaBbCc consists of three dominant and three recessive alleles.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.