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519 questions in this collection · Page 24 of 52
Question 231 of 519
📘 CLASS XII
Principles Of Inheritance And Variation
According to the Law of Dominance, characters are controlled by discrete units called _______.
The Law of Dominance states that characters are controlled by discrete units called factors.
Question 232 of 519
📘 CLASS XII
Principles Of Inheritance And Variation
The genotypic ratio 1/4 TT : 1/2 Tt : 1/4 tt in the F2 generation is mathematically condensable to the form of the _______ expression (ax + by)2.
The 1/4 : 1/2 : 1/4 ratio of TT : Tt : tt is mathematically condensable to the form of the binomial expression (ax + by)2.
Question 233 of 519
📘 CLASS XII
Principles Of Inheritance And Variation
In the case of incomplete dominance in Snapdragon, the F2 generation resulted in a phenotypic ratio of 1 Red : 2 Pink : 1 White, which is identical to the _______ ratio.
In incomplete dominance, the genotype ratios (1:2:1) were exactly as expected in a Mendelian monohybrid cross.
Question 234 of 519
📘 CLASS XII
Principles Of Inheritance And Variation
The plasma membrane of red blood cells has sugar polymers that protrude from its surface, and the kind of sugar is controlled by the gene _______ in ABO blood grouping.
ABO blood groups are controlled by the gene I, which controls the kind of sugar polymer on the red blood cell surface.
Question 235 of 519
📘 CLASS XII
Principles Of Inheritance And Variation
In human ABO blood grouping, the three alleles governing the character are IA, IB, and _______.
The gene (I) has three alleles IA, IB and i.
Question 236 of 519
📘 CLASS XII
Principles Of Inheritance And Variation
When starch grain size in pea seeds is considered as the phenotype, the alleles B and b show _______ dominance, as the heterozygotes produce intermediate size grains.
If starch grain size is considered as the phenotype, then the alleles show incomplete dominance because the starch grains produced are of intermediate size in Bb seeds.
Question 237 of 519
📘 CLASS XII
Principles Of Inheritance And Variation
Mendel's Law of Independent Assortment states that segregation of one pair of characters is _______ of the other pair of characters when two pairs of traits are combined in a hybrid.
The Law of Independent Assortment states that segregation of one pair of characters is independent of the other pair of characters.
Question 238 of 519
📘 CLASS XII
Principles Of Inheritance And Variation
Mendel's work remained unrecognised until 1900, when it was independently rediscovered by de Vries, Correns and _______.
In 1900, three Scientists (de Vries, Correns and von Tschermak) independently rediscovered Mendel's results.
Question 239 of 519
📘 CLASS XII
Principles Of Inheritance And Variation
Sutton united the knowledge of chromosomal segregation with Mendelian principles and called it the _______ theory of inheritance.
Sutton united the knowledge of chromosomal segregation with Mendelian principles and called it the chromosomal theory of inheritance.
Question 240 of 519
📘 CLASS XII
Principles Of Inheritance And Variation
A classic example of pleiotropy in humans is the disease _______, caused by mutation in the gene coding for phenyl alanine hydroxylase.
Phenylketonuria, which is caused by mutation in the gene that codes for the enzyme phenyl alanine hydroxylase, is an example of pleiotropy.