Following statements are regarding to cortical granule reaction.

A. To initiating the slow block to polyspermy the release of Ca2+ that occurs when the sperm enters the egg is critical for activating the egg’s metabolism and initiating development

B. Calcium ions release the inhibitors from maternally stored messages, allowing these mRNAs to be translated

C. Calcium ions are not release the inhibition of nuclear division, thereby allowing cleavage to occur.

D. Udx1, the enzyme responsible for the reduction of oxygen to crosslink the fertilization envelope, is also NADPH-dependent

E. The fertilization envelope is elevated from the cell membrane by glycosaminoglycans which provides support for the blastomeres during cleavage

Which of the following combinations are correct?

#Question id: 23506

#General Aptitude

#Question id: 5564

#Unit 5. Developmental Biology

At the moment of sperm penetration, human eggs ________.

#Question id: 5704

#Unit 8. Inheritance Biology

What kind of pairing configuration would be seen in prophase of meiosis I in (a) an inversion homozygous, (b) a translocation heterozygote?

#Question id: 23362

#General Aptitude

#Question id: 13131

#Unit 10. Ecological Principles

Biologists performed an experiment with flies to examine the effects of population size on the maintenance of genetic variation  and  on  egg-to-adult survival.  From  a  large  source  population, they  randomly  assigned  eggs  to  three experimental  populations  of  size  N,  equal  to  20,  60,  and0100.  For  later  generations,  they  collected  N  eggs  from each  population  and  moved  them  into  identical  vials  that  co0ntained  f2re0sh  me4d0ium.  Th6e0y  coun8te0d  the  number  of adult flies that emerged and used tissue samples from the adults for genetic analyses. Genetic variation was measured by  scoring  alleles  at  several  polymorphic  loci  and  expressed  as  the  average  number  of  alleles  at  those  loci.  The results are summarized in Figure 1 and Figure 2 below.

The numbers of adult flies that emerged from the three populations in the first generation are closest to which of the following?