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Leni [432]
9 months ago
15

Which of the following processes might produce a human zygote with 45 chromosomes?A)a non-disjunction in meiotic anaphase occurr

ing in either an egg or spermB)failure of the egg nucleus to be fertilized by the spermC)failure of an egg to complete meiosis IID)incomplete cytokinesis during spermatogenesis after meiosis I
Biology
1 answer:
pogonyaev9 months ago
7 0

A non-disjunction in meiotic anaphase occurring in either an egg or sperm might produce a human zygote with 45 chromosomes. A condition in which human contain 45 chromosomes instead of 46 chromosomes is called aneuploidy or abnormal chromosome number.

<h3>What is aneuploidy?</h3>

The occurrence of one or more extra or missing chromosomes leading to an unbalanced chromosome complement, or any chromosome number that is not an exact multiple of the haploid number (23).                                                                                           It is the presence of an abnormal number of chromosomes in a cell, for example a human cell having 45 or 47 chromosomes instead of the usual 46.                                                                                                                  An extra or missing chromosome is a common cause of some genetic disorders.                                                                                                       The most common cause of aneuploidy happens during cell division when the chromosomes do not separate properly between the two cells.

learn more about aneuploidy: brainly.com/question/14745202

#SPJ1

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Which statement below describes a feature that is shared between kinesin and dynein? a. Both proteins "walk" towards the (+) end
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Answer:

C)Both proteins bind ATP and F-actin

*C option is not mentioned* there is a flaw in the question

Explanation:

Two families of motor proteins, kinesin and dynein, transport membrane-bounded vesicles, proteins, and organelles along microtubules. Nearly all kinesins move cargo toward the (+) end of microtubules (anterograde transport), whereas dyneins transport cargo toward the (−) end (retrograde transport).While

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5 0
3 years ago
Lesch-Nyhan syndrome is an X-linked, recessive condition caused by mutation of the HPRT1 gene responsible for purine metabolism.
Elanso [62]

Answer:

B. The father did not contribute a sex chromosome to his daughter due to nondisjunction of the sex chromosomes. The daughter is XO and her only X chromosome came from her mother, who was a carrier.

A.The mother's X chromosomes failed to separate during meiosis, and the daughter inherited two X chromosomes with the Lesch-Nyhan mutation. The father contributed no sex chromosomes.

Explanation:

As seen in the question above, a little girl was diagnosed with Lesch-Nyhan syndrome, which is an X-linked recessive condition caused by a mutation in the HPRT1 gene responsible for purine metabolism.

The little girl's parents do not have the syndrome, and no one in the little girl's paternal family presented this syndrome, however, we know that the maternal grandfather of the little girl's mother had the syndrome, which means that it was the mother's genetic material that contributed to the development of the syndrome in the little girl. This was because the little girl did not receive any X chromosomes from her father, but she inherited the two X chromosomes from her mother that coded for the Lesch-Nyhan mutation. This happened because the mother's X chromosome disjuction did not occur during meiosis I.

As shown above, the father did not contribute any sex chromosomes to his daughter, which means that the daughter is XO and her only X chromosome came from her mother, who was a carrier.

3 0
2 years ago
What molecule is the source of information for transcription.
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DNA is the molecule, which is the source of information for transcription.

• During the process of transcription, RNA polymerase is an enzyme, which is accountable for copying a sequence of DNA into a sequence of RNA.

• The RNA polymerase monitors the phenomenon of transcription.

• At the time of transcription, the information is stored within a molecule of DNA, which is further copied into a new molecule of messenger RNA.

Thus, the correct answer is DNA.

To know more about:

brainly.com/question/16512679

7 0
2 years ago
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When blood pH becomes overly acidic, respiration and kidney function change to bring the acidity back to its normal pH level of
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Answer:

homeostasis

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Homeostasis has to do with processes that maintain the internal balance within an organism. It can succinctly be defined as the process of regulating an organism's internal environment. The process of homeostasis is very important in the maintenance of important indicators of balance in the body such as body temperature, body pH, etc.

Hence, when blood pH becomes overly acidic, respiration and kidney function change to bring the acidity back to its normal pH level of 7.4. This is a homeostatic response.

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