Answer:
e. Red segregated from brown in meiosis I, and straight segregated from curled in meiosis I.
Explanation:
A cross between two flies heterozygous for both genes produced an offspring with the phenotypic ratio of 9:3:3:1. This ratio is expected according to Mendel's law of independent assortment, which states that alleles of the same gene assort independently during gamete formation.
Before meiosis starts in flies, a single diploid cell duplicates its DNA, so each chromosome has 2 sister chromatids that contain the same information.
- During meiosis I, <u>the homologous chromosomes separate</u> into two daughter cells. The chromosome number is reduced by half, but each chromosome has two sister chromatids.
- During meiosis II, <u>the sister chromatids separate</u> and each daughter cell from meiosis I divides into two new daughter cells (to get the total of 4 haploid cells).
In a heterozygous fly, each homologous chromosome contains a different allele, and the sister chromatids are copies that carry the same allele. For that reason, both traits were segregated during meiosis I.
Answer:
option B) is correct
Explanation:
The all or none response means that if a muscle contracts, it will contract completely. Thus implying the all or none law which states:
The potential of a response of a muscle fiber or nerve cell is independent of the potential of the stimulus. If a stimulus is more than a certain critical value it will trigger muscle fiber or a nerve. Most importantly resulting in either an all-or-none response thus reducing possibility of any information loss.
D. all the above I just took the test for it
RNA, 3, 4.
The very important thing here is the knowledge of the process of how a cell makes a protein, and this is quite simple. It starts at the nucleus of a cell, with the polymerase RNA reading the DNA and then making a single RNA ribbon, the mRNA, this contains 4 kinds of ribonucleotides, adenylate, guanylate, uridylate, cytidylate. This ribbon then gets out of the nucleus carried by tRNA containing the codon that matches these for, but in cracks (3).
Don't forget that this process is all based in amino acids, a protein is formed by these, and each crack will determine what this protein or that one will do for the cell's survival. So the conclusion to that is: all the proteins in your body are based in your own DNA, that's why you are who you are.
