What is meant by the term heterozygous?
A gene is made from 160016001600 base pairs. The table below shows the percentage of each nitrogenous base found in this gene.
| Percentage of base | Name of base |
|---|---|
| 282828 | cytosine |
| 222222 | adenine |
| 282828 | (i) [missing base] |
| 222222 | thymine |
Identify the name of the missing base.
Calculate how many adenine bases you would expect to find in this gene.
In Shorthorn cattle, the inheritance of coat colour is controlled by codominant alleles. The allele for red coat is CRC^RCR, and the allele for white coat is CWC^WCW. When a homozygous parent with a red coat is crossed with a homozygous parent with a white coat, all of the offspring have a roan coat (a mixture of red and white hairs).
Give the genotype of each of the following:
Two of the roan offspring are crossed. What is the probability that their offspring will also have a roan coat?
