The development of the vertebrate eye is a classic example used to describe the modus operandi of tissue organization via intercellular interactions.

TLS Online TPP Program

#Id: 6334

#Unit 8. Inheritance Biology

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

TLS Online TPP Program

#Id: 6335

#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.

 

TLS Online TPP Program

#Id: 6336

#Unit 8. Inheritance Biology

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

TLS Online TPP Program

#Id: 6337

#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.

TLS Online TPP Program

#Id: 6338

#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

TLS Online TPP Program

#Id: 6339

#Unit 8. Inheritance Biology

Sex-Linked Characteristics Characteristic determined by a gene or genes on sex chromosomes.