Advertisements
Advertisements
प्रश्न
Give the ratio of phenotype of these crosses.
उत्तर
phenotype ratio of :
(a) TT x Tt - All progeny plants will be tall
(b) tt x TT - All the progeny plants will be tall
(c) TTrr x ttRR = All progeny will be tall having round seeds
(d) TtRr x TtRr = 9 : 3 : 3 : 1 (9 - Tall and Round seeds; 3 - Tall and wrinkled seeds; 3 - Dwarf and Round seeds; 1 - Dwarf and wrinkled seeds.)
APPEARS IN
संबंधित प्रश्न
What is the peculiarity of the ‘DNA’ structure?
In a homozygous pea plant, axial flowers (A) are dominant over terminal flowers (a).
(i) What is the phenotype and genotype of the F1 generation if a plant bearing pure axial flowers is crossed with a plant bearing pure terminal flowers?
(ii) Draw a Punnett square board to show the gametes and offsprings when both the parent plants are heterozygous for axial flowers.
(iii) What is the phenotypic ratio and genotypic ratio of the above cross shown in (ii)?
(iv) State Mendel’s Law of Dominance.
(v) Name two genetic disorders commonly seen in human males.
State the three Mendel’s laws of inheritance.
Choose the correct answer:
A cross where two pairs of alleles are considered is a ____________
Discuss any two points due to which Mendel got success in his experiment?
Give an account of incomplete dominance with a suitable example.
In the following crosses write the characteristics of the progeny
| Cross | Progeny |
| (a) RR YY × RR YY | __________________ |
| Round, yellow Round, yellow | __________________ |
| (b) Rr Yy × Rr Yy | __________________ |
| Round, yellow Round, yellow | __________________ |
| (c) rr yy × rr yy | __________________ |
| wrinkled, green wrinkled, green | __________________ |
| (d) RR YY × rr yy | __________________ |
| Round, yellow wrinkled green | __________________ |
Enlist the steps of controlled cross pollination. Would emasculation be needed in a cucurbit plant? Give reasons for your answer.
At which stage, did Mendel observe the segregation of alleles in garden pea plants?
