A tall violet flowered plant (TTVV) is crossed with a dwarf white flowered plant (ttvv). When the F₁ plants are self pollinated, a total of 1600, F₂ plants are produced. In the same experiment how many $F_{2}$ plants show $F_{1}$ phenotype?

900

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600

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300

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100

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Solution

The correct option is A
900

This is a typical dihybrid cross. Both parents are homozygous, so two different types of gametes will be formed- (TV) and (tv) respectively. The $F_{1}$ will be heterozygous with the genotype TtVv. Four different gametes are formed by the $F_{1}$ plants - (TV), (Tv), (tV), (tv). The phenotypes in the $F_{2}$ progeny are observed in a 9:3:3:1 ratio.

As seen in the Punnett square above, 9/16 plants will have the dominant phenotype similar to $F_{1}$ progeny. Therefore out of 1600 $F_{2}$ plants, if 9/16 of them are of the $F_{1}$ phenotype; 9/16 * 1600 = 900 plants would express this phenotype.

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A tall violet flowered plant (TTVV) is crossed with a dwarf white flowered plant (ttvv). When the $F_{1}$ plants are self-pollinated, a total of 1600 $F_{2}$ plants are produced. How many plants of $F_{2}$ generation are similar to the original parents in terms of both genotype and phenotype?

In the same experiment how many $F_{2}$ plants show $F_{1}$ phenotype?

Q. A pea plant bearing violet flowers, pure line for the trait, was crossed with another plant bearing white flowers. The

F_{1}

progeny was self-crossed. If 200 plants are produced in

F_{2}

generation, predict the number of plants under each category mentioned:
i. Dominant
ii. Recessive
iii. Homozygous dominant

Question 1
A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic makeup of the tall parent can be depicted as
(a) TTVV
(b) TTvv
(c) TtVV
(d) TtVv

Question 1
A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic makeup of the tall parent can be depicted as
(a) TTVV
(b) TTvv
(c) TtVV
(d) TtVv

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A tall violet flowered plant (TTVV) is crossed with a dwarf white flowered plant (ttvv). When the F1 plants are self pollinated, a total of 1600, F2 plants are produced. In the same experiment how many F2 plants show F1 phenotype?

A tall violet flowered plant (TTVV) is crossed with a dwarf white flowered plant (ttvv). When the F₁ plants are self pollinated, a total of 1600, F₂ plants are produced. In the same experiment how many $F_{2}$ plants show $F_{1}$ phenotype?