Fruit shape in shepherd's purse ( Capsella bursa ) is of two types - triangular and top - shaped . Triangular fruit shape (T) is dominant over top - shape (t) . Following table summarise the results of several crosses .
Cross | Result |
Strain 1 X tt | All triangular |
Strain 2 X tt |
1 triangular : 1 top-shaped |
Strain 3 X tt |
All top-shaped |
Strain 4 X Tt |
3 triangular : 1 top-shaped |
Which pair of strains possess the genotype Tt?
Strains 2 and 3
Strains 2 and 4
Strains 1 and 3
Strains 1 and 4
As we learnt ,
The segregation of alleles -
when the tall and dwarf plant produce gametes the alleles of the parental pair separate of segregate from each other and only one allele is transmitted to a gamete.
- wherein
The segregation of alleles is a random process and there is a 50% chance of gamete containing either allele