Question

In plants, tall stem is dominant and short stem is recessive. Which of the following would be true about the plants produced from the pollination between two short stemmed plants.

1. 100 % of the plants in the next generation would be short.

2. We can't predict what the plants in the next generation will look like.

3. The plants in the next generation would have a different genotype than the parent plants

4. the plants in the next generation would have a different phenotype than the parent plants.

Answer 1

Given in plants, tall stem Is dominant and short stem is recessive. So, let allele for dominant = T = tall ; and allele for recessive = t = short.

The Genotypes responsible for Dominant phenotyes are = TT and Tt ( as T is Dominant to t) = tall stem

The Genotype responsible for recessive phenotye is = tt = short stem.

Now question says when 2 short stemmed plants are pollinated the true statement is :

Short stem= tt X tt

	t	t
t	tt	tt
t	tt	tt

All plants have Genotype = tt ---- so phenotye = Short.

So, on crossing 2 short stemmed plants 100% of plants in next generation will be short stemmed or short.

Correct answer is Option A.

Thank you.?