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Biology · PRINCIPLES OF INHERITANCE AND VARIATION
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Biology · PRINCIPLES OF INHERITANCE AND VARIATION
In pea seeds, starch synthesis is controlled by a single gene with alleles \( B \) and \( b \). Considering starch grain size as the phenotype, the alleles show (i)_________, whereas considering seed shape (round vs. wrinkled) as the phenotype, allele \( B \) shows (ii)_________.
Read answer →Biology · PRINCIPLES OF INHERITANCE AND VARIATION
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).\n Assertion (A): In a monohybrid cross of Antirrhinum majus (snapdragon) between true-breeding red-flowered and white-flowered plants, the phenotypic and genotypic ratios in the \( F_2 \) generation are identical (1:2:1).\n Reason (R): The allele for red flower colour is completely dominant over the allele for white flower colour, allowing heterozygous individuals to express a blended phenotype.\nIn the light of the above statements, choose the correct answer from the options given below:
Read answer →Biology · PRINCIPLES OF INHERITANCE AND VARIATION
Mendel selected 14 true-breeding pea plant varieties as pairs. Which of the following pairs correctly matches the character with its dominant and recessive traits?
Read answer →Biology · PRINCIPLES OF INHERITANCE AND VARIATION
Gregor Mendel conducted hybridization experiments on garden peas for how many years, and what was novel about his methodology compared to earlier biologists?
Read answer →Biology · PRINCIPLES OF INHERITANCE AND VARIATION
Refer to the test cross concept described in NCERT. When a violet-flowered pea plant of unknown genotype is crossed with a white-flowered plant (\( vv \)) and all resulting offspring produce violet flowers, what is the genotype and phenotype interpretation of the unknown parent?
Read answer →Biology · PRINCIPLES OF INHERITANCE AND VARIATION
In Mendelian genetics, the term 'monohybrid cross' refers to a cross between two plants that differ in:
Read answer →Biology · PRINCIPLES OF INHERITANCE AND VARIATION
During artificial hybridization experiments in pea plants, emasculation refers to the removal of:
Read answer →Biology · PRINCIPLES OF INHERITANCE AND VARIATION
The genotypic ratio of a monohybrid cross \( 1/4\,TT : 1/2\,Tt : 1/4\,tt \) is mathematically condensable as a binomial expression:
Read answer →Biology · PRINCIPLES OF INHERITANCE AND VARIATION
A man with blood group AB (\( I^A I^B \)) marries a woman with blood group A whose father had blood group O (\( ii \)). What is the probability that their first child will be a male with blood group B, and what is the total number of different genotypes possible in their offspring?
Read answer →Biology · PRINCIPLES OF INHERITANCE AND VARIATION
Gregor Mendel conducted hybridization experiments on garden peas for 7 years (1856-1863). Which of the following contributed significantly to the credibility and success of his inferences?
Read answer →Biology · PRINCIPLES OF INHERITANCE AND VARIATION
Consider the following statements regarding the historical background of genetics mentioned in NCERT:\n(A) Humans knew as early as 8000-1000 B.C. that variation was hidden in sexual reproduction.\n(B) Sahiwal cows in Punjab were developed through artificial selection and domestication from ancestral wild cows.\n(C) Our ancestors had a deep understanding of the scientific and molecular basis of inheritance.\nWhich of the above statements are correct?
Read answer →Biology · PRINCIPLES OF INHERITANCE AND VARIATION
Read the following statements regarding the concept of dominance:\n Statement I: The unmodified allele, which represents the original phenotype, produces a normal functional enzyme and behaves as the dominant allele.\n Statement II: A modified allele that produces a non-functional enzyme or no enzyme at all generally behaves as a recessive allele, as the phenotype depends solely on the functioning unmodified allele.\nIn the light of the above statements, choose the correct option:
Read answer →Biology · PRINCIPLES OF INHERITANCE AND VARIATION
Which of the following correctly pairs a character studied by Mendel in garden pea with its correct dominant and recessive traits?
Read answer →Biology · PRINCIPLES OF INHERITANCE AND VARIATION
