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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Fraternal twins are nonidentical siblings that form when two eggs nature are released, and are fertilized at die same time. Explain why an unusually high level of FSH raises the likelihood of fraternal twins.

Summary Introduction

To explain: Unusually high levels of FSH raise the likelihood of fraternal twins.

Concept introduction: Twins are the offspring that share the same womb for the same gestation period. Twins are of two types, identical twins and fraternal twins. Fraternal twins are the result of two sperms fertilizing two different ova at the same time. Follicle stimulating hormones is responsible for releasing the Graaffian follicle.

Explanation
Hypothalamus releases gonadotropin-releasing hormone that stimulates the pituitary to release the follicle stimulating hormone (FSH). The FSH induces the release of the Graaffian follicle from the ovary. If FSH levels are very high, then superovulation may occur where more than one ova is released during the same menstrual period...

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