Assume that a G

Question

allele stands for the green pod color, a g
allele −
yellow pod color, an I
allele −
inflated pod shape, and an i
allele −
constricted pod shape. Two pea plants heterozygous for the characters of pod color and pod shape are crossed. Which gamete types will the obtained heterozygous plant form?
Select all that apply.

Gg

Gi

Ii

gi

GgIi

gI

GI

GG

ii

Answer 1

To determine the potential gamete types produced by a heterozygous plant for two traits (pod color and pod shape), we can use the following notation:

• For pod color: G (green) is dominant over g (yellow), so a heterozygous genotype would be Gg.
• For pod shape: I (inflated) is dominant over i (constricted), so a heterozygous genotype would be Ii.

When two heterozygous plants (GgIi) are crossed, we can use the principle of independent assortment to find all possible gamete combinations.

The possible gametes produced by one parent can be derived from the combination of alleles for the two traits. The allele combinations can be found by considering each allele separately:

For Gg (pod color):

• Possible alleles: G or g

For Ii (pod shape):

• Possible alleles: I or i

Thus, the gametes generated from one heterozygous plant will be:

1. GI (from G and I)
2. Gi (from G and i)
3. gI (from g and I)
4. gi (from g and i)

So the correct gamete types obtained from the heterozygous plant would be:

• GI
• Gi
• gI
• gi

Therefore, the answers are:

• Gi
• gI
• GI
• gi

The other options such as Gg, Ii, GgIi, GG, and ii are not valid gametes because gametes contain only one allele from each trait.