The stage at which all the cells show crossover chromosomes is meiotic prophase I. The crossover is the exchange of genetic material between homologous chromosomes. Homologous chromosomes are present in the meiosis I. Regarding the phase of meiosis I, it is expected that the crossover takes place in meiotic prophase I since homologous chromosomes pair up in the prophase.

5 0

4 years ago

Can somebody give me the answer for these...

labwork [276]

Answer:

1. Life cycle of a cell starts from

G1 phase - S phase (synthesise phase) - G2 phase - mitosis.

2. By mitosis bcoz it restore nucleo cytoplasmic ratio means ploidy of cell remain same.

3. Bcoz of transformation of normal cells into cancerous cells by Carcinogens present in tobacco.,drugs .etc

4 mitosis occurs in plants animals

Binary fission occurs in bacteria and other single celled organism.

Both give rise to two daughter cells.

5.sex cells (n) are produced by meiosis from gamete mother cells(2n).

6.in meiosis ploidy of cell become half

Means diploid cell form haploid cells

And 4 haploid daughters cells are formed.

In mitosis, ploidy of cell remain same

Means haploid form haploid and diploid form diploid.

1 cell form 2 daughter cells.

Hope this helps you.. Frnd ❤️

4 0

4 years ago

Ans:using a filament of spirogyra in a laboratory Demonstrate how plasmolysi wil occur

sdas [7]

Answer:

plasmolysis is the shrinkage of protoplast from the cell wall under the influence of a hypertonic solution.this can be observed by placing the fresh filament of spirogyra in a 10% solution of common salt.the cell undergoes exomosis.

I hope this helps

5 0

3 years ago

Match each term to the appropriate description.

anzhelika [568]

Answer:

Ecosystem - All orca whales around the world.

Species -a group of orca whales living along the Gulf of Alaska.

Organism - a group of orca whales living along the Gulf of Alaska.

Community - all orca whales, fish, and seaweed living in one area.

Population - all orca whales, fish, seaweed, islands, and the Pacific Ocean.

Explanation:

Hope this helps, i'm sorry if it's wrong.

3 0

3 years ago

Read 2 more answers

First person to answer correctly get brainliest!.......the heart is to____muscle as the stomach is to____

First person to answer correctly get brainliest!.......the heart is tomuscle as the stomach is to