Crossing over does not occur in male Drosophila.
Important Questions on Inheritance
A cross was performed between two parent plants of unknown genotypes. The offspring were segregated based on two flower characteristics i.e. flower colour [magenta or white] and flower position [axillary or terminal] and counted. The two genes responsible for these characters are not linked and segregate independently. Based on the information given in the table, predict the genotypes of the parents.
| phenotype | magenta and axillary | magenta and terminal | white and axillary | white and terminal |
| number of offspring |
A round seeded tall pea plant is crossed with round seeded dwarf plant and obtained progeny are with following phenotypes
- Tall, Round
- Dwarf, Round
- Tall, Wrinkled
- Dwarf, Wrinkled
The possible genotype of parents:
| RT | Rt | rT | rt | |
|---|---|---|---|---|
| RT | 1 | 2 | 3 | 4 |
| Rt | 5 | 6 | 7 | 8 |
| rT | 9 | 10 | 11 | 12 |
| rt | 13 | 14 | 15 | 16 |
If plant 7 is crossed with plant 12, then what proportion of the offsprings produced will be homozygous for both the recessive characters
If tall (T) is dominant over dwarf (t) and round seeds (R) is dominant over wrinkled seeds (r) and the genotype is tt Rr, then the phenotype would be:
