Arabidopsis thaliana is a model plant species with five chro

Arabidopsis thaliana is a model plant species with five chromosome pairs (all autosomes). You are interested in five genes, one on each chromosome. You cross two individuals that are both fully homozygous at these five loci, but have completely different alleles from each other. With respect to these genes of interest... a) How many different gametes can each parent produce? b) How many different genotypes are possible in the F1? c) If a certain F1 plant is chosen, how many different gametes could it produce? d) If the F1 plant from part (c) is self-crossed, how any genotypes are possible in the F2?

Solution

If we consider the Genotypes of Each parent as shown:

Parent-1 genotype: AABBCCDDEE, Parent-2: aabbccddee

Then

a. Each parent can produce only single type of gametes either with ABCDE or abcde alleles

b. Only single genotype possible by the fusion of ABCDE or abcde gametes. I.e AaBbCcDdEe

c. 2⁵ = 2x2x2x2x2 = 32 (Based on 2ⁿ , where n = number of genes)

d. As it is penta hybrid cross, the total genotypes possible are 3ⁿ = 3⁵ = 3x3x3x3x3 = 243