Color blindness is a sex-linked recessive trait. A mother with normal color vision and a color blind father have a color blind daughter. Which can you conclude on the offspring?

The daughter will be color blind

Explanation:

Sex-linked characters such as colour vision are determined by a gene located on the X-chromosome.

Now the daughter will be colour blind because she inherited the recessive allele for colour blind vision that was masked in her mother (that is why she had normal colour vision), but expressed in father (reason for his being colour blind).

Thus, her colour blind vision means she possess a homozygous allelic pair for the sex-linked character, since her both parents contributed X-chromosome each.

humans, along with other animals and plants, have linear chromosomes that are arranged in pairs within the nucleus of the cell. the only human cells that do not contain pairs of chromosomes are reproductive cells, or gametes, which carry just one copy of each chromosome.

that is wrong, its not thymus.