Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
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.
What is the primary difference in observable traits between Mendelian inheritance and polygenic inheritance?
The text contrasts them: 'Mendel’s studies mainly described those traits that have distinct alternate forms... But if you look around you will find that there are many traits which are not so distinct in their occurrence and are spread across a gradient.' This gradient is characteristic of polygenic inheritance.
Which of the following parts of the flower primarily develops into the fruit after fertilization?
The NCERT text mentions 'the end products of sexual reproduction, the fruits and seeds.' While not explicitly detailed in the provided excerpts, general biological knowledge (which NEET expects) dictates that the entire ovary develops into the fruit after fertilization, containing the seeds formed from the ovules. The ovule develops into the seed, not the fruit itself.
After fertilization, the integuments of the ovule transform into which part of the seed?
The NCERT text describes the ovule having 'one or two protective envelopes called integuments.' Post-fertilization, these integuments are crucial for protecting the developing embryo and endosperm, eventually hardening to form the seed coat.
What is the collective term for all the structural and developmental changes that occur in the flower after fertilization?
The chapter outline itself includes '1.4 Post-fertilisation: Structures and Events,' explicitly defining this phase of sexual reproduction. These events encompass the development of the zygote, endosperm, fruit, and seed.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.