Cdc13 is a positive activator of telomerase

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.

 

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#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.

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#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.

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#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

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#Id: 6339

#Unit 8. Inheritance Biology

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

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#Id: 6340

#Unit 8. Inheritance Biology

X-linked characteristic Characteristic determined by a gene or genes on the X chromosome.  Y-linked characteristic  Characteristic determined by a gene or genes on the Y chromosome. The locus for the blue pigment is found on chromosome 7, and those for the green and the red pigments lie close together on the X chromosome.