A plant may have green, white, or green-and-white (varie...

Question

A plant may have green, white, or green-and-white (variegated) leaves on its branches, owing to a mutation in the chloroplast that prevents color from developing. Predict the results of the following crosses:

Ovule Source Pollen Source
(a) Green branch x White branch
(b) White branch x Green branch
(c) Variegated branch x Green branch
(d) Green branch x Variegated branch

Accepted Answer

Hi, everybody. Let's take a look at this practice problem together which of the following statements about mono hybrid cross is true. Now, recall that mono hybrid crosses were used by Mendel. And if we look at the word itself, mono is a prefix that means one and hybrid means a mix of two different things. Therefore, a mono hybrid cross would be a cross of one tree between two hybrid or as we would call hetero ziggy's parents. So quickly recall height in pea plants as an example, the mono hybrid cross in pea plants therefore, would be between parents that are both big t little T where big T is the tall, a little and little T is the short, little, the punnett square would look like this. And in a mono hybrid cross, you always produce a phenotype in a 3 to 1 ratio, which means three of the offspring will display the dominant phenotype and one of the offspring would display the recessive phenotype. So in our example, that's three tall plants to one short. Now let's review the statements and identify the true one. A it involves the study of two traits at the same time. So this is false, this would be called a die hybrid cross. So A is incorrect for c it involves the study of multiple traits at the same time. This is also false. This would be called a palla genic cross. Then we've got option D it is only used for the study of traits in plants. This is also false, mono hybrid crosses are not exclusive to plants. So therefore the answer must be option B it involves the study of one tree at a time. Alright, everyone. I hope you found this helpful and I'll see you soon for the next practice problem.

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