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In tomatoes, dwarf (d) is recessive to tall (D), and opaque (light-green) leaves (op) are recessive to green leaves (Op). The loci that determine height and leaf color are linked and separated by a distance of 7 m.u. For each of the following crosses, determine the phenotypes and proportions of progeny produced.
A. D Op/ d op*d op/d op
B. D op/ d Op*d op/d op
C. D Op/d op*D Op/op d op
D. D op/d Op*D op/d Op

Respuesta :

Histrionicus

Answer:

a). D Op / d op X d op / d op –Parents

as we know,

Distance (m.u.) = Recombination frequency (%)

D Op / d op genotype produces 4 types of gametes as below:

Recombinant gametes (7%):

D op = 3.5% ,    d Op= 3.5%

Non-recombinant gametes (93%):

D Op= 46.5% ,   d OP =46.5%

Genotype, d op / dop produces only one type of gametes, d op.

                                                    d op

D OP (46.5%)                    D OP/d op (46.5%) = Tall, green

D op (3.5%)                        D op/d op (3.5%) = Tall, opaque

d OP (3.5%)                        d OP/d op (3.5%)= Dwarf, green

d op (46.5%)                       d op/d op (46.5%) = Dwarf, opaque

b).  similarily D op / d Op X d op / d op –Parents

Distance (m.u.) = Recombination frequency (%)

D op / d Op genotype produces 4 types of gametes similarily as in case a,

Genotype, d op / dop produces only one type of gametes, d op.

                                                            d op

D OP (3.5%)                        D OP/d op (3.5%) = Tall, green

D op (46.5%)                       D op/d op (46.5%) = Tall, opaque

d OP (46.5%)                       d OP/d op (46.5%)= Dwarf, green

d op (3.5%)                          d op/d op (3.5%) = Dwarf, opaque

c).  D Op / d op X D Op / d op -----Parents

D Op / d op genotype produces 4 types of gametes as below:

Recombinant gametes (7%):

D op = 3.5% = 0.035 , d Op= 3.5%=0.035

Non-recombinant gametes (93%):

D Op= 46.5%=0.465 ,  d OP =46.5%=0.465

The table is attached for C.

d).  D op / d Op X D op / d Op –Parents

Distance (m.u.) = Recombination frequency (%)

siliarily as a, b, and c gametes are four with the same frequency and table for the answer is attached

Recombinant gametes (7%):

D op = 3.5% = 0.035 , d Op= 3.5%=0.035

Non-recombinant gametes (93%):

D Op= 46.5%=0.465 ,  d OP =46.5%=0.465

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