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purpletortoise229Lv1

28 Sep 2019

Which of the following are factors that likely influencephenotype? Select all correct answers.

a) Uterine environment during fetal development

b) Differences in the cytoplasmic contents between two(otherwise identical) populations of kidney cells

c) Temperature

d) Diet

e) Combinations of alleles in your genome

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Jarrod RobelLv2

28 Sep 2019

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Related questions

1.) Alterations in chromosome number can occur with any chromosome, but most alterations are not seen in human populations because:

A) the phenotype is homozygous recessive.

B) the phenotype is expressed in a continuous range in a given population and thus does not stand out.

C) they are lethal during fetal development.

D) most are corrected during the first mitotic event in the fertilized egg.

E) the genotype still represents a normal condition.

2.) Polygenic traits display phenotypes that

A) are most commonly reflective of the heterozygous condition.

B) usually express the dominate condition in greater than 75% of the population.

C) represent a continuous range within the population.

D) often are lethal to second generation of children.

E) are masked by a codominance condition.

3.) Which of the following is most likely involved in the determination of intelligence?

A) one gene

B) multiple genes

C) the environment

D) one gene and the environment

E) multiple genes and the environment

purplefox331

Question 4 (9 points):

To study T cell development, and self-restriction of T cells, you decide to perform some experiments. You obtain four mouse strains: B, B-MCC, K, and K-MCC. B strain mice express MHC molecules of the b haplotype (e.g. H-2K^b, H-2D^b, I-A^b) while K mice express MHC of the k haplotypes (e.g. H-2K^k, H-2D^k, I-A^k). The strains are otherwise genetically identical. B-MCC and K-MCC are identical to the B and K strains (respectively) excepts that contain a transgene encoding the antigen Moth Cytochrome which is not present in normal mice. MCC is produced as both a secreted and cytoplasmic protein and it is expressed by dendritic cells and thymic epithelial cells. You lethally irradiate groups of mice from all four strains and perform all possible bone marrow transfers among the mice. In other words, the BM of each strain is transplanted into mice of each strain, producing 16 different combinations of donor BM and recipient strain. You now take T cells from the lymph nodes of each of the 16 types of transplanted mice and test their ability to proliferate in response to MCC-presenting B cells that express only class II MHC molecule, I-A^k. Fill out the chart below by indicated which mice will have T cells that respond. Use (+) to indicated proliferation and NR to indicate a lack of proliferation. In addition, for the mice labelled a-e give a brief explanation for your answer. Include the mechanism of T cell selection experienced in thymus (positive selection, negative selection, or neglect) and the cells involved in selection (thymic epithelial cels, BM-derived APCs, or both).

Table (4 points, 0.25 points per box)

Recipient Strain Â®

BM Donor	B	B-MCC	K	K-MCC
B			c.
B-MCC			d.
K	a.	b.	e.
K-MCC

1 point for each explanation

yellowguinea-pig868

Match the term with its correct definition or explanation.

Chromatin

Homologous Chromosomes

Sister chromatids

Diploid

Interphase

S Phase

Synapsis

Crossing Over

Cell Plate

Cleavage Furrow

A. The exchange of genetic material between homologous chromosomes during meiosis I.

B. The pairing or tight association of homologous chromosomes in meiosis I. Results in the formation of a tetrad.

C. Non-identical copies of the same chromosome. Present in all diploid cells, even before replication. These chromosomes are the same length and contain genes for the same characteristics, but may have different alleles for each gene. D.

The period of the cell cycle that includes G1, S phase, and G2. E. A structure that develops during cytokinesis in plants.

F. Condensed chromosomes.

G. An invagination that develops during cytokinesis in animal cells.

H. When an organism has two copies of every chromosome (2n).

I. Two identical copies of a chromosome. These are only present after DNA replication.

J. The phase of the cell cycle when DNA is replicated.

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