Answer: The answer is Prophase and Metaphase
Explanation:
A) During late Prophase:
- spindle fibers form, and chromosomes become shorter and fatter.
- Each chromosome then appear as pair of chromatids - SISTER CHROMATID - joined at the centromere
B) During Metaphase:
- the sister chromatids arranged themselves on the equator of the spindle, only to draw apart during late Metaphase.
Thus, the stages of mitosis where one would expect to find that each chromosome is composed of sister chromatids is PROPHASE AND METAPHASE
The correct answer that would best fit the given statement above would be option B. In an experiment designed to measure the distance a golf ball is hit by clubs made of different material, a standardized variable would be the <span> type of material the club is made of. Hope this answer helps.</span>
Answer: Meiosis produces the sex cells, that is the gametes (sperm cells and eggs) that unite to form a zygote. Meiosis ensures that the gametes have have haploid chromosomes so that the resulting zygote from their fusion will have diploid chromosomes.
Explanation: Meiosis is a type of cell division in which a cell divides twice to produce four daughter cells each with the half the number of chromosomes as the parent cell. Without meiosis new gametes are not produced. Meiosis ensures that the chromosomes are evenly distributed among the daughter cells and that each daughter cell contains 23 chromosomes. A sperm cell with 23 chromosomes fuses with an egg with 23 chromosomes to form a zygote with 46 chromosomes. If meiosis does not occur, gametes with haploid chromosomes will not be produced, and if the gametes have diploid chromosomes because meiosis does not occur, sexual reproduction will be a disaster because when two diploid gametes fuse the resulting zygote with be abnormal.
Characteristics of Lancelets:
Small
Elongated
Marine invertebrate
Lacks a jaw
No sense organs
Has a notochord
Example: Lamprey
Characteristics of Tunicates:
Marine invertebrate
Has an outer coat that is rubbery or hard
Has two siphons
Examples: sea squirts, salps
