A Tt plant, which is heterozygous for genes controlling one character (height), is known as a _______.
Since the Tt plant is heterozygous for genes controlling one character (height), it is a monohybrid.
Question 212 of 519
📘 CLASS XII
The graphical representation developed by Reginald C. Punnett to calculate the probability of all possible genotypes of offspring in a genetic cross is called the _______.
The production of gametes and offspring can be understood from a diagram called Punnett Square, developed by Reginald C. Punnett.
Question 213 of 519
📘 CLASS XII
In a typical monohybrid cross, the phenotypic ratio observed in the F2 generation is _______.
In the F2 generation, the phenotypic ratio is 3/4th tall : 1/4th tt, i.e., a 3:1 ratio.
Question 214 of 519
📘 CLASS XII
The genotypic ratio of TT: Tt: tt in the F2 generation of a monohybrid cross is _______.
The 1/4 : 1/2 : 1/4 ratio of TT: Tt: tt represents a genotypic ratio of 1:2:1.
Question 215 of 519
📘 CLASS XII
A cross used to determine the genotype of an organism showing a dominant phenotype by crossing it with the recessive parent is called a _______.
To determine the genotype of a tall plant at F2, Mendel crossed it with a dwarf plant, which he called a test cross.
Question 216 of 519
📘 CLASS XII
Mendel's Second Law is known as the Law of _______, which states that alleles do not show any blending and segregate during gamete formation.
Mendel's Second Law is the Law of Segregation, based on the fact that alleles do not show blending and segregate such that a gamete receives only one factor.
Question 217 of 519
📘 CLASS XII
The inheritance of flower colour in the dog flower (Antirrhinum sp.), where a cross between red (RR) and white (rr) produces pink (Rr) F1 progeny, is a classic example of _______.
In the dog flower, the F1 (pink) had a phenotype in between the two parents, demonstrating incomplete dominance.
Question 218 of 519
📘 CLASS XII
When the F1 generation resembles both parents, such as in human ABO blood grouping where IA and IB are expressed simultaneously, the phenomenon is called _______.
In co-dominance, the F1 generation resembles both parents; when $I^A$ and $I^B$ are present together they both express their own types of sugars.
Question 219 of 519
📘 CLASS XII
The ABO blood grouping system is an example of _______ because there are three alleles (IA, IB, and i) governing the same character in the human population.
The example of ABO blood grouping provides a good example of multiple alleles, where there are more than two (three) alleles governing the same character.
Question 220 of 519
📘 CLASS XII
In a dihybrid cross, the phenotypic ratio observed in the F2 generation, such as round, yellow to wrinkled, green, is _______.
In the dihybrid cross, the phenotypes appeared in the ratio 9:3:3:1.
