Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Gametogenesis has parallel stages in egg and sperm formation. The stage in eggs that is equivalent to spermatids is the:

a. primary oocyte.

b. oogonium.

c. ovum.

d. ootid and polar bodies.

e. secondary oocyte andpolar body.

Summary Introduction


Sexual reproduction takes place when a sperm fertilizes an egg and an individual is born. The sperm is formed by a process called spermatogenesis and egg by oogenesis. These are produced in testis and ovaries, respectively, under optimum conditions. These when fertilized form zygote and get nourished to form offspring.


Justification/explanation for the correct answer:

Option (d) is ootid and polar bodies. The process of oogenesis takes place where a diploid oogonium undergoes replication to form multiple primary oocytes. The primary oocytes are divided by meiosis to form secondary oocyte, followed by the second meiotic division to form ootid along with two polar bodies. The same phenomenon occurs when spermatogonium replicates into the primary oocyte and undergo meiosis twice to form spermatids. Hence, option (d) is correct.

Explanation for the incorrect answers:

Option (a) is given as primary oocyte. The oogonium that is formed by mitosis from the germ cells is present in the ovary in females. These cells replicate to form the primary oocytes. The similar cells known as primary spermatocytes are formed by the process of spermatocytogenesis in males. So, it is an incorrect option.

Option (b) is given as oogonium. The oogonium is the first cell that is formed by the process of mitosis...

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