Close inbreeding is harmful because it increases the proportion of homozygotes and thereby boosts the probability that deleterious and lethal recessive alleles.

TLS Online TPP Program

#Id: 10000

#XL - T Zoology

Calcineurin phosphatase, dephosphorylates and activates the transcription factor, Nuclear Factor Associated with T cells (NFAT).

TLS Online TPP Program

#Id: 10001

#XL - T Zoology

Vertebrates have three homologues of the Drosophila hedgehog gene: sonic hedgehog (shh), desert hedgehog

(dhh), and indian hedgehog (ihh)

TLS Online TPP Program

#Id: 10002

#XL - T Zoology

Desert hedgehog protein is found in the Sertoli cells of the testes

TLS Online TPP Program

#Id: 10003

#XL - T Zoology

Mice homozygous for a null allele of dhh exhibit defective spermatogenesis

TLS Online TPP Program

#Id: 10004

#XL - T Zoology

Indian hedgehog is expressed in the gut and cartilage and is important in postnatal bone growth

TLS Online TPP Program

#Id: 10005

#XL - T Zoology

Sonic hedgehog is responsible for assuring that motor neurons come only from the ventral portion of the neural tube & essential for normal patterning of the limbs