Predict what would be the hereditary results in the following cases:
What are the symptoms of Thalassaemia?
OR
Tabulate three pairs of opposite traits regarding the seed of the pea plant as selected by Mendel. Show the process of sex determination in men with the help of a checkerboard.
Hereditary Results for Thalassaemia
1. One parent thalassaemic (tt), one parent carrier (Tt):
2. Both parents carriers (Tt × Tt):
| Parents Genotype | Offspring Genotype | Percentage |
| Thalassaemic & Carrier | Carrier (Tt) or Thalassaemic (tt) | 50% each |
| Carrier & Carrier | Normal (TT) | 25% |
| Carrier (Tt) | 50% | |
| Thalassaemic (tt) | 25% |
The symptoms of Thalassaemia
Or
The three pairs of opposite traits regarding the seed of the pea plant as selected by Mendel
| Trait | Dominant allele | Recessive allele |
| Seed colour | Yellow (Y) | Green (y) |
| Flower colour | Purple (P) | White (p) |
| Pod shape | Round (R) | Wrinkled (r) |
Or
Sex determination is the process by which an individual is identified as male or female. In humans and most animals, sex is determined by the presence or absence of specific sex chromosomes. Females typically have two X chromosomes (XX), while males have one X and one Y chromosome (XY). The presence of the Y chromosome determines maleness, while the absence of it results in femaleness.
Sex Determination in Men
| X (From Mother) | X (From Mother) | |
| X | XX (Girl) | XX (Girl) |
| Y | XY (Boy) | XY (Boy) |
More WBBSE Moderate level questions
Match the words in column-A with the most appropriate words in column B and re-write the correct pair mentioning the serial no. of both columns Column-A Column-B 1. Diabetes insipidus (a) Law of Independent Assortment 2. Schwann cell (b) Brittleness of bone 3. Meiosis (c) Exists between neurolemma and myelin sheath of axon 4. Senescence phase (d) Hyposecretion of ADH 5. Genetic disease (e) Spore mother cell and germ mother cell 6. The second law of Mendel (f) Colour blindness
Write two causes behind Mendel's success in conducting experiments on heredity.
Prove the authenticity of the statement — "The phenotypic and genotypic ratio remain identical in case of Incomplete Dominance".
As the gene responsible for haemophilia is recessive, so the symptoms of this disease is only manifested in ____ condition.
Determine the nature of the pea plant germinated from the seed produced as a result of pollination between a hybrid tall (Tt) and a pure dwarf (tt) pea plant: (a) 100% Tall (b) 50% Tall, 50% Dwarf (c) 100% Dwarf (d) 75% Tall, 25% Dwarf
Identify the genotype of guineapig having white coat colour and rough hair — (a) bbRR, bbrr (b) BBRR, bbrr (c) bbRR, bbRr (d) BbRr, BbRR
Match the words in Column A with the most appropriate words in Column B and rewrite the correct pair mentioning the serial no. of both columns (any five): [1×5=5] Column A Column B 2.13 Adrenaline (a) Air Pollutant 2.14 Self pollination (b)According to Haldane the hot marine water containing different organic compounds 2.15 The position of flower is axial (c)The adoloscent phase of human development 2.16 Hot Dilute Soup (d)No need of agent 2.17 SPM (e)The senescence phase of human development. 2.18 Britleness of bone and pain at bone joints (f) Increases heart beat, cardiac output and blood pressure. (g) Dominant trait
With the help of a checkerboard show the phenotypic ratio of offspring produced in F2 generation as a result of a cross between a pure black coloured and rough-haired guinea pig and a pure white and smooth-haired guinea pig. "Father plays the main role in the determination of sex of the offspring" - justify the statement with the help of a checkerboard. [3+2=5] OR Write three reasons behind Mendel's success. Establish a relationship between phenotype and genotype with the help of proper examples. [3+2=5]
Match the words in column-A with the most appropriate words in column B and re-write the correct pair mentioning the serial no. of both columns COLUMN - A COLUMN - B 1. Meninges (a) Decrease in the number of digits in the legs 2. Sexual reproduction (b) Submergence of islands 3. Roller tongue (c) Centromere 4. Evolution of the horse (d) Telomere 5. Environmental problem of Sundarban (e) Protects brain and spinal cord from mechanical injury 6. Attaches chromosome with spindle fibre (f) Controlled by autosome (g) Occurs through the production of gametes and their union
What is the role of genetic counselling in the eradication of geneticdisease from the society? Black-smooth hair is produced in F₂ generation resulting from a cross between pure black-rough haired guinea pig (BBRR) and pure white-smooth haired guinea pig (bbrr). Show their possible genotypes and genotypic ratios with the help of a table. [3 + 2]
Mention the dominant and recessive traits of two characters related with seed and one character related with flower of pea plant. Very often it is experienced that a colour-blind son is born to apparently normal parents. Show with the help of a cross how it happens.
In which of the following crosses, will the F1 generation seed's tall and dwarf traits appear in a 1:1 ratio? (a) Tt x Tt (b) TT x Tt (c) TT x tt (d) Tt x tt
