The multi-atom combinations are called molecules. A molecule is the smallest part of a substance that has the physical and chemical properties of that substance.

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#Unit 8. Inheritance Biology

Environmental Sex Determination

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#Unit 8. Inheritance Biology

Sequential hermaphroditism Phenomenon in which the sex of an individual organism changes in the course of its lifetime.

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#Unit 8. Inheritance Biology

Many turtles, crocodiles, alligators, and a few birds is affected by temperature during embryonic development.  In turtles, for example, warm incubation temperatures produce more females, whereas cool temperatures produce males.

In alligators, the reverse is true.

 

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#Unit 8. Inheritance Biology

Sex Determination in Drosophila melanogaster Y-linked characteristic  Characteristic determined by a gene or genes on the Y chromosome.

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#Unit 8. Inheritance Biology

Haplodiploid sex determination

In hymenoptera insects, males are haploid, and females are diploid.  All fertilized eggs give rise to female and unfertilized eggs give rise to males.

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#Unit 8. Inheritance Biology

ANDROGEN-INSENSITIVITY SYNDROME

These individuals have female external sexual characteristics. Vagina ends blindly and that the uterus, oviducts, and ovaries are absent.

 Inside the abdominal cavity, a pair of testes produce levels of testosterone normally seen in males. 

Woman with androgen-insensitivity syndrome contain an X and a Y chromosome. 

Testosterone bind to an androgen receptor. This receptor is defective in females with androgen-insensitivity syndrome.

The gene for the androgen receptor is located on the X chromosome