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TLS Online TPP Program

#Question id: 5669

What is the reproductive difference between sea urchins and mammals is?

#Unit 5. Developmental Biology

  1. The sea urchin egg completes meiosis prior to fertilization, but meiosis in mammals is completed after fertilization

  2. Sea urchin eggs and sperm are of equal size, but human eggs are much bigger than mammal’s sperm

  3. Sea urchins, but not mammals, have a need to block polyspermy, because only in sea urchins can there be more than one source of sperm to fertilize the eggs

  4. Sea urchin zygotes get their mitochondria from the sperm, but mammals zygote get their mitochondria from the egg.

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TLS Online TPP Program

#Question id: 23730

#Unit 8. Inheritance Biology

The susceptibility exceeds a threshold value, the characteristic is expressed is,
 
TLS Online TPP Program

#Question id: 23731

#Unit 8. Inheritance Biology

Which one of the following statements is INCORRECT?
TLS Online TPP Program

#Question id: 23732

#Unit 8. Inheritance Biology

According to this figure, which of the following statements is correct;
                 
a) The genotype affects plant weight, but the environmental conditions determine which genotype produces the heavier plant.
b) The environmental conditions affects plant weight, but the alleles determine which type of genotype produces the heavier plant.
c) It shows the Genetic–environmental interaction variance
d) It shows only environmental variance (Ve)
TLS Online TPP Program

#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