An F1 tall, round seed pea plant is crossed with a dwarf, wrinkled seed pea plan

Question

An F1 tall, round seed pea plant is crossed with a dwarf, wrinkled seed pea plant. The following offspring are observed: Tall, round: 510 Tall, wrinkled: 495 Dwarf, round: 490 Dwarf, wrinkled: 505 a. What is the expected phenotype ratio? #:# or #:#:#:#, depending on what you think the answer is. b. What is the calculated chi-square value? Format your answer with 1 significant digit (i.e. 0.#). Sure, you can try to guess it 10 times, but work it out so you make sure you know how to do this for the test. The chi-square equation won't be provided on the test, so make sure you put it on the permitted 3 times 5" note card.

Explanation / Answer

Answer:

1 : 1 : 1 : 1 =   Tall, round : Tall, wrinkled : Dwarf, round : Dwarf, wrinkled

The cross is test cross (a cross between F1 hybrid and pure homozygous recessive parent)

Tall= T

Dwarf = t

Round = R

Wrinkled = r

TtRr (F1) x ttrr (recessive parent)

tr

TR

TtRr (tall, round)

Tr

Ttrr (tall, wrinkled)

tR

ttRr (dwarf, round)

tr

ttrr (dwarf, wrinkled)

tr

TR

TtRr (tall, round)

Tr

Ttrr (tall, wrinkled)

tR

ttRr (dwarf, round)

tr

ttrr (dwarf, wrinkled)

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