Question

In: Biology

In plants, twisted leaves, a hypothetical mutant phenotype, may be caused by either a chloroplast gene...

In plants, twisted leaves, a hypothetical mutant phenotype, may be caused by either a chloroplast gene (CT = normal; Ct = twisted) or a recessive nuclear gene (NT = normal; Nt = twisted). Assume chloroplast DNA is maternally inherited. Predict the genotypic and phenotypic ratios in the offspring of the following crosses:

a.         CT NtNt female x Ct NTNT male

b.         Ct NtNt female x CT NTNT male

c.         F1 male from cross (a) x F1 female from cross (b)

Solutions

Expert Solution

In all the offspring the chloroplast gene will have the maternal effect therefore

The plant leaves in

Parent              (female) CT NtNt      X        Ct NTNT (male)

Gamete                        CT Nt Nt         X         Ct NT NT

F1                                CT NTNt , CT NTNt, CT NTNt, CT NTNt

All the plant will have Normal leave

Parent              (female) Ct NtNt       X        CT NTNT (male)

Gamete                        Ct Nt Nt          X         CT NT NT

F1                                Ct NTNt , Ct NTNt, Ct NTNt, Ct NTNt

All the plant will have twisted leave because the mutated gene from chloroplast will be responsible for the twisted leaves

Parent              (female) Ct NtNt       X        Ct NtNt (male)

Gamete                        Ct Nt Nt          X         Ct Nt Nt

F1                                Ct NtNt , Ct NtNt, Ct NtNt, Ct NtNt

All the plant will have twisted leave because the mutated gene from chloroplast and from the nuclear recessive gene will be responsible for the twisted leaves

gladiator answered 1 year ago
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