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Nikolay [14]
3 years ago
7

When cells are going through rapid cell divisions during the first stage of animal development called "cleavage", which of the f

ollowing phases of the cell cycle are lost? (Choose ALL correct answers) Group of answer choices
Biology
1 answer:
alexira [117]3 years ago
4 0

Early cleavage divisions in most embryos are also rapid. One reason for this is that cleaving cells have a modified cell cycle, in which the two gap phases, G1 and G2 are completely omitted, and the cells cycle rapidly between M and S phases. In addition, because the major cytoskeletal systems of the cells are largely devoted to mitosis (microtubules) and cytokinesis (microfilaments) during rapid cleavage division, there is typically an antagonism between periods of rapid cell division and cell movement. Thus as the embryo approaches gastrulation, there is a tremendous slowing in the rate of division (note the slope of the curve at the right).

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In man, assume that spotted skin (S) is dominant over non-spotted skin (s) and that wooly hair (W) is dominant over non-wooly ha
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Answer:

Total four genotypes and its frequency  

SsWw – 4/16

ssWw- 4/16

Ssww - 4/16

ssww - 4/16

Phenotype –  

SsWw – Heterozygous  Spotted skin and heterozygous wooled hair

ssWw  - Homozygous non-spotted skin and heterozygous wooled hair

Ssww  -  Heterozygous  Spotted skin and Homozygous non -wooled hair

ssww  - Homozygous non-spotted skin  and Homozygous non -wooled hair

Explanation:

Given -

Allele for spotted skin is "S"

Allele for non-spotted skin is "s"

Allele for Wooly hair is "W"

Allele for non-wooly hair is "w"

Allele "S" is dominant over "s"

And Allele "W" is dominant over "w"

Cross is carried out between heterozygous spotted, non-wooly man and heterozygous wooly-haired, non-spotted woman

Genotype of heterozygous spotted, non-wooly man - Ssww

Genotype of  heterozygous wooly-haired, non-spotted woman - ssWw

Ssww * ssWw

Sw         Sw         sw         sw

sW SsWw SsWw ssWw ssWw

sw Ssww Ssww ssww ssww

sW SsWw SsWw ssWw ssWw

sw Ssww Ssww ssww ssww

Total four genotypes and its frequency  

SsWw – 4/16

ssWw- 4/16

Ssww - 4/16

ssww - 4/16

Phenotype –  

SsWw – Heterozygous  Spotted skin and heterozygous wooled hair

ssWw  - Homozygous non-spotted skin and heterozygous wooled hair

Ssww  -  Heterozygous  Spotted skin and Homozygous non -wooled hair

ssww  - Homozygous non-spotted skin  and Homozygous non -wooled hair

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Please help quickly
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meiosis I hope this helps

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