The F1 generation differed from the F2 in the Mendel's experiments in that all the F1 generation showed the dominant phenotype, however only three- fourths or three quarters of the F2 generation did. This is because all the F1 generation were heterozygous and thus the dominant phenotype was expressed, while in the F2 generation there was a mixture of homozygous dominant, homozygous recessive and heterozygous. Therefore, the heterozygotes and the homozygotes dominant showed a dominant phenotype.
Answer:
9:3:3:1.
Explanation:
The offspring produced with the ratio of 9:3:3:1 in this crossing. In the F1 generation, all the organisms have the dominant allele but when the two F1 organisms are allowed to mate with each other, the highest ratio of offspring i. e. 9 having dominant allele is produced, hybrid organisms are also produced in the ratio 3 and in the last the offspring that have recessive allele is produced having the ratio of 1.
I think the answer is A which is the axon
1.Amniocentesis is a procedure which involves draining a small amount of amniotic fluid. Amniotic fluid contains a few cells from the fetus. Chromosomes in the cells, which contain the genetic information of the fetus, are examined for abnormalities
2. DNA testing, introduced in 1976, is used to identify specific gene disorders.
The relationship is MUTUALISM