Question

a) If a parent has the genotype aaBb, what combinations of alleles can the parent give to its gametes based on the principle of independent assortment?

b) In the space provided below, briefly explain how the ancestors of eukaryotes developed mitochondria and chloroplasts.

Answer 1

Genotype aaBb

Combination of Alleles in gametes: aB, ab

Formula to find number of combinations: 2^N

N= No of heterozygote in paretnetal genotype.

In this case: n=1

so 2¹=2 combinations

2. Mitochondria and Chloroplast are hypothetically supposed to be endosymbionts that started living inside the eukaryotic cells during evolution. They had a mutual relation with eukaryotic cell where they provided advantage to the cell and required some material in exchange. This advantage could be in terms of utilizing oxygen(Mitochondria) or using solar energy (Chloroplast).