When the F1 generation resembles both parents, as in the ABO blood grouping in humans, this phenomenon is called:
In the case of co-dominance, the F1 generation resembles both parents. A good example is ABO blood grouping where alleles IA and IB are present together and both express their own types of sugars.
Question 102 of 519
📘 CLASS XII
How many alleles for the I gene control the ABO blood groups in the human population?
The ABO blood groups are controlled by the gene I, which has three alleles: IA, IB, and i. This is also an example of multiple alleles.
Question 103 of 519
📘 CLASS XII
Genetics is the branch of biology that deals with the inheritance, as well as the ___________ of characters from parents to offspring.
Genetics deals with the inheritance, as well as the variation of characters from parents to offspring.
Question 104 of 519
📘 CLASS XII
___________ is the process by which characters are passed on from parent to progeny; it is the basis of heredity.
Inheritance is the process by which characters are passed on from parent to progeny; it is the basis of heredity.
Question 105 of 519
📘 CLASS XII
Gregor Mendel conducted hybridisation experiments on garden peas for ___________ years.
Gregor Mendel conducted hybridisation experiments on garden peas for seven years (1856-1863).
Question 106 of 519
📘 CLASS XII
Mendel applied statistical analysis and mathematical logic to problems in biology for the first time during his investigations into ___________ patterns.
During Mendel’s investigations into inheritance patterns it was for the first time that statistical analysis and mathematical logic were applied to problems in biology.
Question 107 of 519
📘 CLASS XII
A true-breeding line is one that, having undergone continuous self-pollination, shows the stable trait inheritance and expression for several generations; Mendel selected ___________ true-breeding pea plant varieties.
Mendel selected 14 true-breeding pea plant varieties, as pairs which were similar except for one character with contrasting traits.
Question 108 of 519
📘 CLASS XII
In Mendel's monohybrid cross of tall (TT) and dwarf (tt) pea plants, all the F1 progeny plants were ___________.
Mendel observed that all the F1 progeny plants were tall, like one of its parents.
Question 109 of 519
📘 CLASS XII
When Mendel self-pollinated the F1 tall plants, the proportion of dwarf plants in the Filial 2 (F2) generation was ___________ of the total plants.
The proportion of plants that were dwarf were 1/4th of the F2 plants.
Question 110 of 519
📘 CLASS XII
Which of Mendel's Laws states that the alleles for a gene segregate (separate) from each other during gamete formation, such that each gamete receives only one allele?
The Law of Segregation (Mendel's First Law) states that the two alleles for a trait carried by a diploid organism separate during meiosis, ensuring gametes are haploid for that trait.
