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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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Anonymous sara5656
wrote...
5 months ago
1) See first image 
Identify the phase(s) from the image above that best illustrates each of the following stages of mitosis AND include your explanation of why. (2 marks).

a. Interphase
b. Prophase
c. Metaphase
d. Anaphase
e. Telophase/Cytokinesis

ANSWER WHY AS WELL PLEASE







2) A group of bird embryos was studied to see if the hair cells in cochlea were able to regenerate after trauma. The first group of bird embryos was treated with growth factors similar to brain-derived neurotrophic factor molecules. The second group of bird embryos had specialized growth genes introduced into their genomes through a virus. The third group was untreated and left to develop without growth factors and gene therapy. The total number of hair cells per cochlea was determined at 10 days and compared at hatching (day 21) through scanning electron microscopy.

Identify the manipulated, responding and controlled variables in this study.







3) The longest phase of the cell cycle is Answer
 
 and the shortest is Answer
 
.
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wrote...
#1
Educator
5 months ago
Quote
1) See first image
Identify the phase(s) from the image above that best illustrates each of the following stages of mitosis AND include your explanation of why. (2 marks).

a. Interphase
b. Prophase
c. Metaphase
d. Anaphase
e. Telophase/Cytokinesis

ANSWER WHY AS WELL PLEASE

  • The phase indicated by A arrow is prophase as thick DNA stands are seen loose in the nucleus
  • The phase indicated by B arrow is metaphase as the chromosomes are lined up on the equatorial line of the cell.
  • The phase indicated by arrows C and D is interphase as chromatin material is least condensed and is loosely distributed in the nucleus.
  • The phase indicated by the arrow E is prophase as thick strands of DNA can be seen inside the nucleus.
  • The phase indicated by arrow F is anaphase as chromosomes are seen at separate poles of the cell.
  • The phase is indicated by arrow G is metaphase as chromosomes are present in the middle of the cell at the equatorial plane.

Quote
2) A group of bird embryos was studied to see if the hair cells in cochlea were able to regenerate after trauma. The first group of bird embryos was treated with growth factors similar to brain-derived neurotrophic factor molecules. The second group of bird embryos had specialized growth genes introduced into their genomes through a virus. The third group was untreated and left to develop without growth factors and gene therapy. The total number of hair cells per cochlea was determined at 10 days and compared at hatching (day 21) through scanning electron microscopy. Identify the manipulated, responding and controlled variables in this study.

{see attachment}

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wrote...
#2
5 months ago
Interphase is the longest part of the cell cycle. Please find the attachment, that will help
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