Question

Which gamete will be formed in an individual with genotype aaRR? AR Ar aR ar

Answer 1

• In sexually reproducing organisms, prior to sexual reproduction, germ cells divide by meiosis giving rise to cells with half the total genome called as gametes.

       - Gametes from each parent fuse during fertilisation forming zygote.

       - In meiosis 1 the genome of the parent is reduced to half and the half is transferred to each gamete.

       Solution:

       Here the genotype of the parent is aaRR where 'a' is is the allele for one character and 'R' for another allele.

       Here the two sets of a and R alleles represent that the organism is diploid (carries two sets of homologous chromosomes). The resulting gametes will be haploid i.e each gamete will receive one set of chromsomes.

       One set of parent chromosomes will carry half the alleles for each character i.e aR. The same will be received by the gametes. Because the organism is a homozygous one (similar alleles on both sets) all the gametes will be identical.

       So all the gametes from a parent with genotype aaRR will be aR genotypically. Third option is the correct answer..