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In tomato plants, the germ cells are in the flowers. The yellow (Y) gene controls flower color, such that Y_ plants have yellow flowers and yy plants have white flowers. The red (R) gene controls fruit color, such that R_ have red tomatoes and rr plants have yellow tomatoes. The R and Y genes are 15 maps unit from each other on chromosome 2. A botanist sets up a parental cross between a true breeding yellow flowered plant with red tomatoes and a plant that is true breeding, double-recessive for the Y and R genes.What are the expected frequencies of the recombinant and parental gamete genotypes produced by the F1 plants? Choose all correct answers.

a.Each parental gamete genotype will be produced 50% of the time.

b.each recombinant gamete genotype will be produced 7.5% of the time.

c.the total percentage of gametes with parental genotypes will be 100%.

d.the total percentage of gametes with recombinant genotypes will be 50%.

e.each parental gamete genotype will be produced 42.5% of the time.

f.the total percentage of gametes with recombinant genotypes will be 15%.

g.each recombinant gamete genotype will be produced 25% of the time.

the total percentage of gametes with parental genotypes will be 85%.

Respuesta :

Oseni

Answer:

d.the total percentage of gametes with recombinant genotypes will be 50%.

Explanation:

True breeding yellow flowered plant with red tomatoes = YYRR

True breeding, double recessive plant for Y and R = yyrr

Crossing the two: YYRR   x   yyrr

F1 Progeny = all YyRr genotype with yellow flower and red tomatoes.

F1 gametes: YR (parental), Yr (recombinant), yR (recombinant) and yr (parental)

1/2 or 50% of the gametes have parental genotype while 1/2 or 50% of the gametes also have recombinant genotype.

Hence, the total percentage of gametes with recombinant genotypes will be 50%.

The correct option is d.