Answer:
Explanation:
The correct pairing of the homologous chromosomes and their correct segregation (a chromosome for each daughter cell) are key to the proper development of the new cells, and specially of the new individual if we are talking about the early stages of embryogenesis. If there is an error during the splitting of chromosomes, and one cell gets a double set and the other misses a chromosome, numerical chromosomal abnormalities occur. These numerical abnormalities can happen on autosomes or sexual chromosomes, and common examples are as Down Syndrome (trisomy 21), Patau Syndrome (trisomy 13), Turner Syndrome (45,X) and others.
The number of the trisomy indicates the chromosome pair that suffered the adding or the subtraction of its chromosome.
Answer:
um....if you got the passage how we spposed to tell you.
Explanation:
Nucleic acids. They are larger molecules made up of smaller units called nucleotides. Each nucleotide contains a carbohydrate molecule, a phosphate group, and a nitrogen-containing molecule.
Three factors that affect the biodiversity in an ecosystem
include area, diversity of niches, and climate. Keystone species
also have a large effect.
The tibialis anterior muscle dorsiflexes the foot at the ankle and also assists in inversion of the foot. The tibialis anterior is a muscle that originates in the upper two-thirds of the lateral surface of the tibia and inserts into the medical cuneiform and first metatarsal bones of the foot, it acts as dorsiflex and invert the foot.