At what stage of snapdragon development would you screen for putative mutants in

Question

At what stage of snapdragon development would you screen for putative mutants in embryo pattern formation,

Select only one option from the list below.

a. Zygote

b. Late heart-stage embryo

c. Mature embryo (i.e. seed)

d. Seedling

e. Flowering-stage plant

B. What pros and cons make screening at that stage of snapdragon development the best option?

Select two pros and two cons from the lists below.

Pros

a. It filters out mutants in embryo pattern maintenance

b. It requires less work than screening at other stages

c. It is the first stage at which mutants in embryo pattern formation can be identified

d. It is the first stage of embryogenesis

e. It filters out embryo lethal mutants

Cons

a. It does not filter out mutants in embryo pattern maintenance

b. It requires more work than screening at other stages

c. It misses mutants in embryo pattern formation that do not survive embryogenesis

d. It filters out seedling lethal mutants

e. It does not filter out embryo lethal mutants

C. Which mutant generation would you screen to isolate recessive mutants in embryo pattern formation?

Select only one option from the lists below.

a. M1

b. M2

c. M3

d. Either M1 or M2 e. MO

Explanation / Answer

1) option c

2)

Pros

a. It filters out mutants in embryo pattern maintenance

c. It is the first stage at which mutants in embryo pattern formation can be identified

Cons

b. It requires more work than screening at other stages

c. It misses mutants in embryo pattern formation that do not survive embryogenesis

3) c. M3

because M3 seed can be regrown to see whether the mutation was transmitted in the next generation.

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