Frequency of Down’s syndrome increases when the maternal age is
Frequency of Down’s syndrome increases when the maternal age is
- A
Above $35$ years
- B
Below $35$ years
- C
During $1^{st}$ pregnancy
- D
In mothers of at least $3$ children
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When normal and mutant alleles are present on opposite chromosomes of homologous pair, the heterozygotes are called as
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