Edward syndrome is on account of .......
$45$ chromosomes instead of $46$
Presence of three chromosomes on $18^{th}$ pair of autosome
Presence of three chromosomes on $21^{st}$ pair of autosome
Presence of three pair of sex chromosomes
A man who carries a sex linked gene on his $Y$ chromosome will transmit this gene to
$A$ normal woman, whose father had colour blindness, married a normal man. What is the chance of occurrence of colour blindness in the progeny?
When normal and mutant alleles are present on opposite chromosomes of homologous pair, the heterozygotes are called as
If interference is complete or cent percent then the frequency of observed double crossover will be
$A$ : One drum stick per nucleus is present in the neutrophil of normal female.
$R$ : It is absent in the neutrophil of male