For a species of tropical plant, leaves with green veins (G) are dominant over leaves with red veins (g). A plant that has green veins (GG) is crossed with a plant with red veins (gg). What percentage of offspring will have red veins?

Question

100%

75%

25%

0%

Answer 1

To determine the percentage of offspring that will have red veins (gg), we need to look at the genotypes of the parent plants:

• The first parent plant (with green veins) has the genotype GG.
• The second parent plant (with red veins) has the genotype gg.

When these two plants are crossed, all the offspring will receive one allele from each parent. The possible combinations of alleles from the parents will be:

• From GG (the first parent), the offspring will receive a G allele.
• From gg (the second parent), the offspring will receive a g allele.

This results in all offspring having the genotype Gg:

1. Parent 1: G (always contributes G)
2. Parent 2: g (always contributes g)

So, the offspring will be Gg (green veins) in 100% of the cases.

Since red veins are represented by the genotype gg, and all offspring have genotype Gg, no offspring will have red veins.

Thus, the percentage of offspring with red veins (gg) is 0%.