If you could tell me what cell it would be easier. Sorry I have to post it on Answer but I't does not show the commentary or whatever you guys call it.
DNA replication is said to be semi-conservative because of this process of replication, where the resulting double helix is composed of both an old strand and a new strand. ... Semiconservative replication would produce two copies that each contained one of the original strands and one new strand.
Answer:
Chromosome condenses
Pairing up to form tetrad
Crossing over
Lining up on metaphase plate
Homologous chromosome separate
Explanation:
Condensation of chromosomes occurs in prophase I phase. Pairing up to form tetrad occur during prophase I. Crossing over occurs during prophase I of meiosis cell division. Chromosomes line up along the metaphase plate in the stage of Metaphase. Centromeres break down and homologous chromosomes separate in anaphase I phase of meiosis.
The correct order of expression of the genes listed below in the determination of segmentation in Drosophila is "Hox genes > Gap genes > Pair rule genes > Segment polarity genes"
<u>Order: </u>2 > 3 > 4 > 1
<u>Explanation:</u>
The master regulator genes are that guide the creation of specific body segments or structures known as "Homeotic genes". Since these genes are active in segment patterning, the gap genes, pair-rule genes and segment polarity genes are designated as segmentation genes.
- Many animal homotic genes express transcription factor proteins that include a region called the homeodomain or Hox gene.
- The maternal impact genes express transcription factors which regulate the gap gene expression. The distance genes subdivide the embryo approximately along the anterior / posterior axis.
- The gap genes encode transcription factors which control the pair-rule expression of genes. The pair-regulated genes split the embryo into segment pairs.
- The pair-rule genes encode transcription factors which control the function of the polarity genes in the segment. The polarity genes in the segment determined each segment's anterior or posterior axis.