Neutrophils are derived from myeloblasts. White blood cells can be divided into two lines of generation: The myeloid line and the lymphoid line. The myeloid line gives rise to a kind of white blood cell with characteristic azurophilic granules hence these are called granulocytes. Granulocytes include neutrophils, eosinophils, basophils, and monocytes. All four cells come from the immature cell from the myeloid cell line called myeloblasts. The myeloid line also gives rise to red blood cells and platelets.
The lymphoid line, on the other hand, gives rise to lymphocytes and natural killer cells.
The answer would be D.has no backbone
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Answer:
<u>Sister chromatids are identical forms of chromatids of a chromosomes. They are mostly formed by semi-conservative replication of DNA molecule of a single chromosome.Thus they are like </u><u>'photocopies' </u><u> of original parent chromosomes; joined together at the Centromere</u>.
They are exactly similar in all ramification; with the same gene and allele compositions..
<u>However; slight differences arise between the two identical sisters due to </u><u>mutation</u><u> from</u><u> errors </u><u>at replication;and also in the length of telomere repeats.</u>
Non-sister chromatids are dissimilar forms of chromatids of a chromosomes formed when each half of a chromosome at fertilisation from separate haploid sex-cells, of each parent. fused.They contain different genetic composition;because they are not on the same homologous chromosomes.Therefore crossing -over ensure variation.
<u>However, they are genetically similar in composition; if they are contained in homologous chromosomes</u>. This is because Synapsis of bivalent of these chromosomes allow genetic material to be shared by chromosomal crossing-over between the non-sister chromatids on the chromosomes ; therefore identical genetic characteristics are shared .
Explanation:
Answer:
Earth's temperatures increased, causing widespread evaporation. Earth collided with a large object, forming the moon. Single-celled organisms released oxygen into the air when they photosynthesized.
Answer:
B. functional body cavity lined by tissues derived only from endoderm
Explanation:
From the word "Pseudo" means false i.e something that is not true or literally acting in place for a particular real subject.
Coelom on the other-hand is an fluid-filled hollow cavity that act as the skeletal structure for an organism. They act helps serves as cushion effects for the organism.
Ceolomates are organism that have ceolom and the body tissues are derived from the mesodermal layer that lined the body cavity of organism possessing these ceolom.
But in pseudocoelomate they do not have a true ceolom, but there functional body cavity lined by tissues derived only from the endoderm.