Questions: A human egg with 22 chromosomes that is fertilized by a normal sperm will result in a zygote with trisomy. a zygote with disomy. a zygote with monosomy. a zygote with a normal chromosome number. a fertilized egg with 44 chromosomes.

The answer is the third one: a zygote with monosomy.

Explanation for each option:

1. A zygote with trisomy: Trisomy occurs when there is an extra chromosome, resulting in three copies of a particular chromosome. In this case, the human egg has 22 chromosomes (one less than the normal 23), and a normal sperm has 23 chromosomes. The resulting zygote will have 45 chromosomes, not an extra one for any specific chromosome pair, so this option is incorrect.

2. A zygote with disomy: Disomy is the normal condition where there are two copies of each chromosome. A normal human zygote has 46 chromosomes (23 pairs). Since the egg has 22 chromosomes and the sperm has 23, the resulting zygote will have 45 chromosomes, which is not the normal disomy, so this option is incorrect.

3. A zygote with monosomy: Monosomy occurs when there is one chromosome missing from a pair. In this case, the egg has 22 chromosomes and the sperm has 23, resulting in a zygote with 45 chromosomes. This means one chromosome is missing from a pair, leading to monosomy. Therefore, this option is correct.

4. A zygote with a normal chromosome number: A normal human zygote has 46 chromosomes. Since the egg has 22 chromosomes and the sperm has 23, the resulting zygote will have 45 chromosomes, which is not the normal number, so this option is incorrect.

5. A fertilized egg with 44 chromosomes: This option is incorrect because the egg with 22 chromosomes fertilized by a normal sperm with 23 chromosomes will result in a zygote with 45 chromosomes, not 44.

In summary, the correct answer is that the zygote will have monosomy, as it will have 45 chromosomes, missing one chromosome from a pair.