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.
How is an F′ factor different from an F factor?
Meiotic nondisjunction is much more likely than mitotic nondisjunction. Based on
In fruit flies, curved wings are recessive to straight wings,
What is an advantage and a disadvantage of this repair system?
Explain the type of speciation (allopatric, parapatric, or sympatric
The raw material for evolution is random mutation. Discuss whether or
With regard to the timing of conjugation, explain why the recipient
A woman who is heterozygous, Bb, has brown eyes;
A recessive allele in mice results in an unusally long neck.
Why is an antibody used in this experiment? From