Answer to Question #128259 in Genetics for marya ahmed

Question

select and support the most appropriate response & explain why each of the incorrect statements is eliminated

3. Meiosis in an oocyte
a. creates 4 cells that are identical in size
b. results in qualitatively genetically different meiotic products
c. has an equational division in M I
d. segregates homologous chromosomes in M II
e. creates new allele combinations, along non-sister chromatids, during telophase I

5. Two genetically identical organisms express slightly different phenotypes for a given trait when
raised in different environments. This is an indication that
a. environmental components have a large effect on the expression of the phenotype
b. this phenotype is not multifactorial
c. the trait is determined by a single gene
d. the environment is equally important to the phenotype as the genotype
e. the phenotype is multifactorial but the genotype strongly influences the phenotype

Answer 1

3

a)Meiosis in an oocyte creates 4 cells but they are not identical in size and even in functioning.

b)results in qualitatively genetically different meiotic products- a cell that develops into an egg or ovum; a female gametocyte.

c) has an equational division in M I-Meiosis I has reductional division.

d) Segregates homologous chromosomes in M II-The meiotic division is asymmetric and segregate one set of chromosomes into the oocyte, and the other into small polar bodies that degenerate during pre-implantation development.

e) creates new allele combinations, along non-sister chromatids, during telophase I-The paired chromosomes are the ones that separate from each other in meiotic telophase I and not the sister chromatids.

5.a)environmental components have a large effect on the expression of the phenotype - environmental factors that can determine which genes are turned on and off, thereby influencing the way an organism develops and functions.

b) this phenotype is not multifactorial-the phenotype is multifactorial since multiple genes as well as multiple environmental factors influence it.

c) the trait is determined by a single most human genetic traits are the product of interactions between several genes.

d) the environment is equally important to the phenotype as the genotype-Environmental conditions, such as temperature and availability of nutrients can affect phenotypes.

e) the phenotype is multifactorial but the genotype strongly influences the phenotype-the phenotype is multifactorial but the genotype does not strongly influence the phenotype but it can different phenotypes.