If a thymocyte randomly generated a TCR with an affinity for MHC Class I, the TCR and CD8 would bind MHC Class I together, and generate a signal that specifically initiated a program that is 

a) silenced CD8 expression

b) silenced CD4 expression

c) induced expression of genes specific for helper T-cell lineage function

d) induced expression of genes specific for cytotoxic T-cell lineage function

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#Question id: 23733

#Unit 8. Inheritance Biology

Phenotypic variation is analyzed for milk production in a herd of dairy cattle and the following variance components are obtained: Additive genetic variance= 0.4, Dominance genetic variance= 0.1, Genic interaction variance= 0.2, Environmental variance= 0.5, Genetic−environmental interaction variance= 0.0,  the heritability (H2) of milk production is___

TLS Online TPP Program

#Question id: 23734

#Unit 8. Inheritance Biology

The narrow-sense heritability of ear length in Reno rabbits is 0.4. The phenotypic variance (VP) is 0.8, and the environmental variance (VE) is 0.2. What is the additive genetic variance (VA) for ear length in these rabbits?

TLS Online TPP Program

#Question id: 23735

#Unit 8. Inheritance Biology

Phenotypic variation that is due to genetic differences is referred to as heritability. It can be the Broad-sense heritability and Narrow-sense heritability, the Broad-sense heritability which is ranges from 0 to 1. Identify the correct prediction about these ranges?

a) 0 is all of the phenotypic variance results from differences in genotype

b) 0 is all of the phenotypic variance results from environmental variation

c) 1 is all of the phenotypic variance results from differences in genotype

d) 1 is all of the phenotypic variance results from environmental variation

TLS Online TPP Program

#Question id: 23766

#Unit 7. System Physiology – Animal

The sensory receptors for vision are:

TLS Online TPP Program

#Question id: 23767

#Unit 7. System Physiology – Animal

The sensory receptors for vision are located on the:

TLS Online TPP Program

#Question id: 23768

#Unit 7. System Physiology – Animal

Which of the following cells function as photoreceptors?