Please tell me as much as you can about non-disjunction and the consequences of non-disjunction at meiosis 1 versus meiosis 2

Biology

1 answer:

QveST [7]2 years ago

7 0

Answer/Explanation:

Nondisjunction is when homologous chromosomes or sister chromatids fail to properly separate during meiosis. This means daughter cells have an incorrect set of chromosomes.

Nondisjunction occurs during meiosis I or II, with different results in each. The outcomes at either meiosis i or meiosis ii are shown in the attached picture (nondisjunction at meiosis ii on the left (blue arrow) and nondisjunction at meiosis i on the right (dark green arrow)

Nondisjunction during meiosis i

Nondisjunction during meiosis i occurs when homologous chromosomes fail to properly separate. This results in two gametes without that chromosome, and two gametes with two copies of that chromosome. This is wrong, as each gamete should have one copy.

Nondisjunction during meiosis ii

If the sister chromatids fail to separate during meiosis II (the homologous chromosomes have already successfully separated), then there will be two normal gametes that have one copy of the chromosome (correct), one gamete will not have that chromosome, and one gamete with two copies of the chromosome.

You might be interested in

lakkis [162]

Answer:

a. binomial nomenclature. b. mutations c. common ancestry d. different anatomy please list why. thank you so much!

7 0

3 years ago

Energy is converted from solar to chemical in Process A and then from one form of chemical to another in Proce Process A is best

Mashutka [201]

Process A likely describes a photosynthesis whilst process B describes respiration.

8 0

3 years ago

Which molecules of the adaptive defense system provide humoral immunity by circulating freely in the blood and lymph, where they

alisha [4.7K]

Answer:

Adaptive immune defense system consists of lymphocytes like B-lymphocytes and T- lymphocytes. B-lymphocytes provides humoral immunity while T- lymphocytes provide cell-mediated immunity to the body.

99% of lymphocytes circulate freely in the blood and lymph. B lymphocytes differentiate into plasma B cells and B memory cells when interact with antigen presented by T helper cells.

Then plasma cells secrete antibodies in the circulation which binds to extracellular antigens through antigen-binding site. Then the bounded antigen is recognized by receptors present on phagocytic cells. This receptor binds the Fc region of antigen bounded antibody and destroy the antigen by phagocytosis.

5 0

3 years ago

List 5 different kinds of proteins that might be made by the ribosomes

xenn [34]

A ribosome is a cell organelle. the function of a ribosome is like a micro-machine for making proteins. the ribosomes is composed of special proteins and nucleic acid. it is also formed from two sub units, locking together its function are to translate the encoded information from the cell nucleus provied by the messenger.

8 0

3 years ago

Read 2 more answers

What is cotransport? Explain how understanding it is used in our treatment of diarrhea.

qaws [65]

Answer:

In cotransport, a single ATP-powered pump that transports a specific solute drives the active transport of several other solutes. Normally, sodium in waste is reabsorbed in the colon, maintaining constant levels in the body, but diarrhea expels waste so rapidly that re-absorption is not possible, and sodium levels fall precipitously. To treat this life threatening condition, patients are given a solution to drink containing high concentrations of salt and glucose. The solutes are taken up by sodium-glucose cotransporters on the surface of intestinal cells and passed through the cells into the blood. This simple treatment has lowered infant mortality worldwide.

6 0

3 years ago