Following statements are regarding to the heat production by the activation of sympathetic nervous system.

A. Activation is stimulation of β receptors in brown fat, which increases metabolic rate and heat production.

B. Activation is stimulation of α2 receptors in brown fat, which increases metabolic rate and heat production.

C. Stimulation of α1 receptors in vascular smooth muscle of skin blood vessels, producing vasoconstriction. Vasoconstriction reduces blood flow to the surface of the skin.

D. Stimulation of α1 receptors in vascular smooth muscle of skin blood vessels, producing vasodilation. Vasodilation reduces blood flow to the surface of the skin.

Which of the following combination is correct?

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#Question id: 12160

#Unit 9. Diversity of Life Forms

Which of these was not derived from an ancestral alpha proteobacterium?

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#Question id: 12161

#Unit 8. Inheritance Biology

If a cross is made between  two plant heights  46cm and 10cm. The f2 Genotype has been shown;

I) AABBCC - 2) AABBCc – 3) AABbCc – 4) AaBbCc–  5) AaBbcc – 6) Aabbcc – 7) aabbcc –

Find out the 

i) phenotypic values of the given character 

ii) determining the no of polygenes involves and 

iii) what will be the no of QTL?

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#Question id: 12162

#Unit 8. Inheritance Biology

Nilsson-Ehle’s cross obtained homozygous varieties of wheat that differed in color, he crossed a variety of wheat that possessed white kernels with a variety that possessed  red kernels and obtained the following results:

The following conclusions are made from the results obtained;

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#Question id: 12163

#Unit 8. Inheritance Biology

A cross is made between the two pure line homozygous plant their height is 6cm and 2cm. the F1 progeny shows 6 cm height. the variations takes place in F2 progeny , which were made by 

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#Question id: 12164

#Unit 8. Inheritance Biology

What is the value of broad sense and narrow sense heritability respectively , if the given values of;

A) dominance genetic variance =0.4 , 

B) genic interaction variance =0.3,  

C) additive genetic variance =0.6, 

D) environmental variance=0.8,  

E) genetic−environmental interaction variance=0.3

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#Question id: 12165

#Unit 8. Inheritance Biology

If the environmental variance increases and all other variance components remain same , then what will be the effect on heritability?