Deviations: incomplete dominance, co-dominance, multiple alleles, blood groups, pleiotropy, polygenic inheritance
- What is the pattern of inheritance for polygenic trait? Answer: 2. Non-mendelian inheritance pattern Key idea: Polygenic traits are controlled by many genes, each with a small additive effect, and... 1
- As per ABO blood grouping system, the blood group of father is B^+, mother is A^+ and child is O^+. Their respective genotype can beA. I^Bi / I^Ai / iiB. I^BI^B / I^AI^A / iiC. I^AI^B / iI^A / I^BiD. I^Ai / I^Bi / I^AiE. iI^B / iI^A / I^AI^BChoose th… Answer: 2. A only Key idea: a child with blood group O must be ii, getting one i allele from each parent. So both parents must carry i: fath... 1
- A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny? Answer: 3. Red flowered as well as pink flowered plants Key idea: Snapdragon shows incomplete dominance: RR is red, Rr is pink, rr is white.... 1
- The phenomenon of pleiotropism refers to Answer: 4. a single gene affecting multiple phenotypic expression. Key idea: Pleiotropy is the effect of a single gene on multiple phenotypi... 1
- Persons with ‘AB’ blood group are called as "Universal recipients". This is due to : Answer: 4. Absence of antibodies, anti-A and anti-B, in plasma AB blood group has antigens A and B on RBCs but has no anti-A or anti-B antib... 1
- Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups. Answer: 3. When I^A and I^B are present together, they express same type of sugar. Key idea: In AB blood group, I^A and I^B are codominant a... 1
- In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F_1 generation, pink flowers were obtained. When pink flowers were selfed, the F_2 generation showed white, red and pink flowers. Choose the incorrect statement from the… Answer: 4. Law of Segregation does not apply in this experiment. Key idea: Flower colour in snapdragon shows incomplete dominance, but segre... 1
- Which of the following characteristics represent 'Inheritance of blood groups' in humans ?a. Dominanceb. Co-dominancec. Multiple alleled. Incomplete dominancee. Polygenic inheritance Answer: 3. a, b and c Key idea: ABO blood group inheritance is controlled by one gene with three alleles I^A, I^B, i . Multiple alleles: thr... 1
- Which of the following pairs is *wrongly* matched ? Answer: 1. Starch synthesis in pea : Multiple alleles Starch synthesis in pea is an example of pleiotropy (one gene, many effects), not mult... 1
- The genotypes of a Husband and Wife are I^AI^B and I^Ai.Among the blood types of their children, how many different genotypes and phenotypes are possible ? Answer: 2. 4 genotypes ; 3 phenotypes Write the Punnett cross of the parents and count the distinct genotypes and blood groups. Gametes: I^A... 1