Although many chromosome abnormalities occur due to abnormal cell division in the sperm or egg, they can also occasionally be inherited. The genetic basis for this baby's anomalies can usually be determined by:

a. Errors during dividing of sex cells (meiosis)
b. Errors during dividing of other cells (mitosis)
c. Exposure to substances that cause birth defects (teratogens)
d. None of these

If the XX chromosome in the female fail to separate during meiosis. One egg cell will get XX-CHROMOSOMES and then could fuse with the Y-chromosome of the male parent to yield an offspring with XXY CHROMOSOME. Such baby will be a sterile male showing female body characteristics and intellectual disability as seen in Klinefelter's syndrome.

Other chromosomal abnormalities such as Turner's syndrome, result from errors of division of sex cells

adeoladokun31 adeoladokun31 · Answer 2 · 2020-02-04T15:17:35+01:00

Answer: Option A.

Errors during dividing of sex cells(meiosis).

Explanation:

The genetic basis for the baby's anomalies is usually due to error dividing of sex cells. Meiosis is a celly division in which sex cells divide to form new sex with haploid number of chromosomes. The major error during meiosis is non disjunction.

Non disjunction is a process in which homologous chromosomes fail to separate properly during meiosis, this results in gamete with missing or wrong number of chromosomes. In human it can lead to offspring having 47 or 45 number of chromosomes. These can lead to trisomy conditions( like down syndrome) or sex chromosomes disorders. The embryo are not usually viable in these kind of errors.