QQuestion
Predict what would be the hereditary results in the following cases:
- One of the parents is thalassaemic and the other is a carrier of the thalassaemic gene.
- Both of the parents are carriers of the thalassaemic gene
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.
✓Answer
Hereditary Results for Thalassaemia
1. One parent thalassaemic (tt), one parent carrier (Tt):
- The offspring can be either carriers (Tt) or thalassaemic (tt).
- So, 50% chance to be thalassaemic and 50% chance to be a carrier.
2. Both parents carriers (Tt × Tt):
- The genotypes of the offspring can be: 25% normal (TT), 50% carrier (Tt), 25% thalassaemic (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
- Pale skin
- Fatigue
- Shortness of breath
- Bone deformities
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) |
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