The phenomenon where a single gene product may produce more than one effect, such as the gene controlling starch synthesis in pea seeds also influencing seed shape, is called _______.
A single gene can exhibit multiple phenotypic expression, and such a gene is called a pleiotropic gene, seen in cases like Phenylketonuria.
Question 222 of 519
📘 CLASS XII
Mendel applied _______ analysis and mathematical logic for the first time to problems in biology.
Mendel's investigations were unique because statistical analysis and mathematical logic were applied to problems in biology for the first time.
Question 223 of 519
📘 CLASS XII
Mendel conducted hybridisation experiments on garden peas for _______ years (1856–1863).
Gregor Mendel conducted hybridisation experiments on garden peas for seven years (1856–1863).
Question 224 of 519
📘 CLASS XII
Mendel selected _______ true-breeding pea plant varieties, as pairs which were similar except for one character with contrasting traits.
Mendel selected 14 true-breeding pea plant varieties, as pairs which were similar except for one character with contrasting traits.
Question 225 of 519
📘 CLASS XII
Mendel observed that in the F1 progeny, the trait of the other parent was not seen, and the F1 always resembled _______.
Mendel found that the F1 always resembled either one of the parents, and that the trait of the other parent was not seen in them.
Question 226 of 519
📘 CLASS XII
The tall and dwarf traits studied by Mendel were identical to their parental type and did not show any _______ in the F2 generation.
The tall and dwarf traits were identical to their parental type and did not show any blending.
Question 227 of 519
📘 CLASS XII
Mendel called the stable units passed down from parent to offspring as 'factors'; today we call them as _______.
Mendel called the stable units passed down from parent to offspring as 'factors'. Now we call them as genes.
Question 228 of 519
📘 CLASS XII
If alphabetical symbols are used for genes, the _______ letter is used for the trait expressed at the F1 stage.
The capital letter is used for the trait expressed at the F1 stage and the small alphabet for the other trait.
Question 229 of 519
📘 CLASS XII
In a pair of dissimilar factors, the factor that dominates the other (as in the F1) is called the _______ factor.
In a pair of dissimilar factors, one dominates the other (as in the F1) and hence is called the dominant factor.
Question 230 of 519
📘 CLASS XII
Mendel's Second Law is known as the Law of _______.
Mendel's two general rules are the First Law or Law of Dominance and the Second Law or Law of Segregation.
