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Two plants that are pure bred are crossed. One is short and one is tall, Tall is dominant. If two of their offspring are crossed, what are the
expected phenotypes for the next generation of offspring (F2 generation)?
A. 50% tall, 50% short
B. 100% tall
C. 75% tall, 25% short
D. 100% short

Respuesta :

maforchrist

Answer:

C

Explanation:

after doing the genetic cross the parents will be TT so when you cross you get all are Tt if you cross F1 you get a ratio of

1tall:2heterozygous tall:1short

so tall are 75%and short is 25%

ogorwyne

The answer to this question is option c. When two of their offsprings are crossed the expected phenotypes for f2 is 75% tall and 25% short.

When a tall and short plant are crossed together. All the plants that are their offspring would all be tall, T.

These offspring are the result of the first crossing. They all now have there genes as TS from their parents TT and SS gene.

When these off springs are crossed, they would have some off springs that are tall and some that are short. This is going to be a crossing of TS and TS.  Given that they all possess the tall and short gene.

The ratio of tall to short children they would have according to Mendel is 3:1.

75% : 25% = 3:1

The tall pants are dominant

In conclusion when we divide 75 by 25 we get a ratio of 3:1. This is the ratio of expected phenotypes for The second generation.

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