Please give me a example of …

From genetics numericals can be asked from Mendel's law of inheritance, co - dominance. This can include a test cross to find the dominant and recessive alleles.

e.g> In pea plants, spherical seeds (S) are dominant to dented seeds (s). In a genetic cross of two plants that are heterozygous for the seed shape trait, what fraction of the offspring should have spherical seeds?

e.g> To identify the genotype of yellow-seeded pea plants as either homozygous dominant (YY) or heterozygous (Yy), you could do a test cross with plants of genotype _______.

e.g> A child has blood group O. If the father has blood group A and mother has B, work out the genoty pe of the parents and the possible genotype of other offsprings.

From molecular basis of inheritance numericals can come on Chargaff 's rule, central dogma of life.

e.g> If a double stranded DNA has 20% of C calculate the percent of A

e.g> If the Sequence of one strand of DNA is written as follows: 5'-ATGCATGCATGCATGCATGCATGCATGCAT-3'. Write down the sequence of complimentary strand in 5'---> 3' direction. Also mention the sequence in m- RNA when abovemention coding strand is a transcription unit

From evolution the numericals may come from Herdy - Weinberg Principal, 

e.g> You have sampled a population in which you know that the percentage of the homozygous recessive genotype (aa) is 36%. Using that 36%, calculate the following:

1. The frequency of the "aa" genotype.
2. The frequency of the "a" allele.
3. The frequency of the "A" allele.
4. The frequencies of the genotypes "AA" and "Aa."
5. The frequencies of the two possible phenotypes if "A" is completely dominant over "a."