Answer:
Replicated chromosomes at metaphase I = 66
Sister chromatids at metaphase I = 66 x 2 = 132
Sister chromatids at prophase II = 66
Chromosomes in each sperm cells = 33
Explanation:
Metaphase I of meiosis I would have 66 replicated chromosomes in the testicular cells of the bird. Each of the replicated chromosomes would have two sister chromatids. So, a total of 66 replicated chromosomes would have 66 x 2 = 132 sister chromatids.
Due to segregation of homologous chromosomes towards opposite poles in anaphase I, each daughter cell formed by the end of meiosis I would have 33 replicated chromosomes. So, each of the daughter cells would have a total 33 x 2 = 66 sister chromatids at prophase II.
Since meiosis II maintains the chromosome number, each sperm cell formed by the end of meiosis II would have 33 chromosomes.
Answer:
A diploid zygote is formed; Endosperm will form.
Explanation:
The fertilization in angiosperms (flowering plants) is known as double fertilization. In this process, two male gametes or sperms are involved where one sperm fertilizes the ovum or egg cell and forms a diploid zygote that develops into an embryo while the other sperm fertilizes two polar nuclei and forms a triploid cell that develops into the endosperm.
The female reproductive structure of a flower includes stigma, style, and ovary. During pollination, the pollen grain attaches to the stigma where it begins to germinate and forms a pollen tube that grows into the style and reaches the ovary. It enters the ovary and penetrates an opening in the ovule called the micropyle. The generative cell in the pollen grain travels through the pollen tube and divides to form two sperms that enter into the ovule.
Usually, six cells (three antipodal cells, two synergid cells, and one egg cell) and two polar central nuclei are present in an unfertilized ovule. Here, a process known as syngamy occurs, where one haploid sperm fertilizes the haploid egg cell or ovum and forms a diploid zygote. It later grows into an embryo. The other haploid sperm fuses with the two haploid polar nuclei to form a triploid nucleus that develops into the endosperm (nutrient-rich tissue) which provides nourishment to the growing embryo. Later, the fertilized ovule forms the seed and the ovary develops into the fruit which envelops and protects the seed.
I think calcium but i could be wrong
<span>Well water draws from the sources of water beneath the Earth's surface. This type of water supply is known as "groundwater."
</span><span>Groundwater includes water that flows naturally from below the Earth's surface to the surface by way of springs. Some springs run entirely underground and do not break through the surface. Groundwater also includes water that is contained in a variety of porous materials that lie beneath the Earth's surface, such as silt, gravel, clay and sand. Water collects below ground in these porous materials into structures called aquifers. Generally speaking, well water collects into the well from these water-bearing structures. Wells are situated in the Earth to access the aquifer at a depth well below the surface.</span>
Prokaryotic cells divide using fusion and eukaryotic reproduce by mitosis.