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Arada [10]
3 years ago
9

A skull from the genus Homo that dates from approximately 750,000 years ago is discovered. Where is the foramen magnum be locate

d?
A. at the back of the skull
B. at the front of the skull
C. at the bottom of the skull
D. at the top of the skull
Biology
1 answer:
MatroZZZ [7]3 years ago
3 0
The correct answer would be option C. A skull from the genus Homo that dates from approximately 750,000 years ago has its foramen magnum at the bottom of the skull. The foramen magnum is the opening at the base of the skull where the spinal cord joins the brain. The foramen magnum of a Homo is in a more forward position indicating that it had a more erect posture. 
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Answer:

prophase 1(Homologous chromosomes pair to form a tetrad.

prophase 1(Crossing-over may occur between the non-sister chromatids).

Metaphase 1 (Homologous chromosomes line up at the center of the cell.)

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Metaphase 2 ( The haploid number of duplicated chromosomes line up at the metaphase plate.

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Explanation:

Meiosis is a type of cell division that gives rise to gametes ( offsprings). This type of cell division occurs only in the reproductive organs. A diploid cell has two sets of chromosomes: one from the female parent and the other one from the male parent. When the diploid cell undergoes meiosis, the chromosome replicate once and the nucleus and cell duplicate twice giving rise to four haploid gamete cells.

The phases of meiosis occurs in two step divisions. Homologous pairs separate during the first round cell division which occurs in MEIOSIS 1 while the sister chromatids separate in the second nuclear division called MEIOSIS 2.

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Generally, at the start of meiosis, each member of a homologous pair of chromosomes, which are made up of two chromatids, moves to lie side by side. While they are thus paired, genetic material is exchanged between the chromatids. This is known as CROSSING OVER.

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During the second nuclear division, the chromatids separate and move to opposite ends of each daughter cell giving rise to four gamete cells, each with a haploid number of chromosomes.

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