Crested ducks are heterozygous for the A gene, which, when homozygous, causes embryonic death. The recessive allele of this gene determines the normal development of the trait. When crested ducks are crossed among themselves, ducklings hatch only from 3/4 of the eggs, and 1/4 die before hatching. Among the hatched ducklings, about 2/3 are crested and 1/3 are normal. What will be the offspring from crossing crested ducks with normal ones?
1/2 crested, 1/2 normal.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.