Biology, 02.08.2019 12:30, ochoamiguel46

Which of these is true of the cytoplasm of an unfertilized egg? see concept 18.4 (page 380)?

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The possible answers are
a) It is an unevenly distributed mixture of mRNA, proteins, organelles, and other substances.
b) It is a homogeneous mixture of mRNA, proteins, organelles, and other substances.
c) It does not contain substances that are important in directing development. These substances are supplied by the sperm.
d) It does not contain substances that are important in directing development. Development is directed solely by the surrounding cells.
e) It does not contain substances that are important in directing development. These substances are produced by the DNA of the fertilized zygote.
The correct answer is A.
The fertilized egg cell possesses a mixture of mRNA and proteins that guide the initial steps in the development of the embryo. These molecules are distributed unevenly in the fertilized egg cell, making the cell polar and causing an uneven production of proteins in different parts of the cell. This makes cells more and more different with each new division of the zygote.

answered: Guest

the african cheetah.

this species has a relatively low level of genetic

variation because the population was reduced to a small size approxi-

mately 10,000 to 12,000 years ago.

chapter outline

24.1

genes in populations and the hardy-

weinberg equation

24.2

factors that change allele and genotype

frequencies in populations

24.3 sources of new genetic variation

population genetics

until now, we have primarily focused our attention on genes

within individuals and their related family members. in this

chapter and chapters 25 and 26 , we turn to the study of genes in

a population or species. the field of

population genetics

is con-

cerned with changes in genetic variation within a group of indi-

viduals over time. population geneticists want to know the extent

of genetic variation within populations, why it exists, and how it

changes over the course of many generations. the field of popu-

lation genetics emerged as a branch of genetics in the 1920s and

1930s. its mathematical foundations were developed by theoreti-

cians who extended the principles of gregor mendel and charles

darwin by deriving formulas to explain the occurrence of geno-

types within populations. these foundations can be largely attrib-

uted to three scientists: sir ronald fisher, sewall wright, and j. b. s.

haldane. as we will see, support for their mathematical theories

was provided by several researchers who analyzed the genetic com-

position of natural and experimental populations. more recently,

population geneticists have used techniques to probe genetic

variation at the molecular level. in addition, staggering advances

in computer technology have aided population geneticists in the

analysis of their genetic theories and data. in this chapter, we will

explore the genetic variation that occurs in populations and con-

sider the reasons why the genetic composition of populations may

change over the course of several generations

answered: Guest

Your asshahs has a nice

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