Question

give reasons
(ii) Older mothers have greater chance of conceiving abnormal children.
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Answer 1

Answer:

Older mothers are at high risk of giving birth to a baby with chromosomal abnormalities. This happens because, with the increase in age of the mother, the chances of chromosomal aberrations increase rapidly. With the increase in maternal age, the errors in meiosis are most likely to happen. The pregnancy after 30 years may be complicated as there are chances of miscarriage too.

Answer 2

In older mothers the chances of birth of abnormal children is common due to the following reason:

Explanation:

• The chromosomal aberration can be defined as the change in the structure of the individual chromosome. These kind of changes can result due to the quantitative alteration of the genes or may be caused by the rearrangement of the genes.
• The older mothers who conceive a fetus are susceptible to the chromosomal abnormalities. This occurs due to the fact that with the increase in the age of the mother, the chances of occurrence of the chromosomes aberration are more.
• The error in meiosis during the segregation of the gametes will be prominent.Thus the pregnancy after the age of 30 will become complicating and chances of miscarriage are prominent too.

Learn more about chromosomal aberration:

Structure of chromosome and different type of aberrations in chromosome: https://brainly.in/question/3794516

Define chromosomal aberrations​: https://brainly.in/question/15277863