The mutation is any change that has occurred in the DNA which may include deletion, insertion of bases, etc. The lethal mutation is that kind of mutation that produces a lethal allele that is responsible for the death of the cell or even the individual. When a gene is mutated and is expressed, it leads to the premature death of an organism that is carrying it.
The homozygotes are killed only in the case of recessive lethal alleles whereas both the homozygotes as well as the heterozygotes are killed when the alleles are dominant. Death does not happen immediately but may take months or years to happen.
Meiotic nondisjunction is much more likely than mitotic nondisjunction. Based on
A woman who is heterozygous, Bb, has brown eyes;
Explain why familial breast cancer shows a dominant pattern of inheritance in
How is an F′ factor different from an F factor?
With regard to the timing of conjugation, explain why the recipient
The raw material for evolution is random mutation. Discuss whether or
Why is an antibody used in this experiment? From
Explain the type of speciation (allopatric, parapatric, or sympatric
In fruit flies, curved wings are recessive to straight wings,
A recessive allele in mice results in an unusally long neck.
