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3 years ago

What is true of the cytoplasm of an unfertilized egg?

Biology

1 answer:

Yuri [45]3 years ago

8 0

Answer:

The ovum or egg cell is the part of female reproductive gamete present in oogamous organisms. The ovum is larger, and visible to the naked eye compare to motile sperm cell, and egg cell are not capable of active movement.

The cytoplasm of an unfertilized egg is contain unevenly distributed proteins, mRNA, other organelles, and substances. Many proteins are present in a concentrated form at the one end of the cell, and helping to provide positional information to the growing embryo.

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Which statement about inheritance is true?

Rina8888 [55]

The question is asking us to choose the true statement among: ? Girls get most of their traits from their moms; boys get most of their traits from their dads. - this is not true, most traits are inherited from both parents Male offspring will always have an X-linked genetic disease if the mom is a carrier. - this is not true, as they can inherit the non-affected gene Fathers always determine the gender of the offspring in humans. - this is true! some spermcells carry the Y and some the X genes that determine the gender Males never have Y chromosomes. - this is false, males always do!

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3 years ago

Read 2 more answers

How can invasive species alter an ecosystems food web?

Harlamova29_29 [7]

Invasive species can either replace an organism from the ecosystem food web or replace it.

Explanation:

Invasive species are non-native species which can be animals, plants, micro-organisms, fish, etc. they are very much threatening to the native species and ecosystem food web.
Invasive species are spread by humans mostly, it happens unintentionally when people travel and all. Even climate change could be a reason for its spread.
So, it becomes threatening to native species because when you introduce it into a new ecosystem, it does not have a predator or control. It grows aggressively and takes over the resources for the native species.

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3 years ago

Desert plants are characterized by

Alecsey [184]

Desert plantsare characterized by :
- Long roots , that could reach deep within the ground for water sources
- Thin leaves that make them able to sustain more water against the hot weather

hope this helps

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3 years ago

Which is not a compound? A) 8H2 B) H20 C) 6CaO D 5HCI

vovangra [49]

8H2 is not a compound

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2 years ago

Q - Describe the Mitoses with the help of diagram. write its different phares and explain them.

bonufazy [111]

Answer:

Mitosis is a type of cell division in which single haploid cell (n) or diploid cell (2n) divides into two haploid or diploid daughter cells that are same as the parent.

Mitosis occurs in somatic cells of plants and animals. In this cell division, the two daughter cells have the same number of chromosomes as that in the parent cells.

Mitosis consists of four basic phases: prophase, metaphase, anaphase, and telophase.

1.Prophase:-

It is the first visible stage in karyokinesis. The chromosomes appear as long coiled threads called chromatids. The chromatin becomes shorter, thicker and visible due to the condensation of DNA. The chromatins are now called chromosomes. Stainability of nucleus increase. Each chromosome starts to splits longitudinally into two sister chromatids. These sister chromatids are attached to each other at the centromere. The nuclear membrane and nucleolus start to disappear and by the end, it will be completely disappeared.

ii. Metaphase:-

Nuclear membrane and nucleolus completely disappears and simultaneously appearance of spindle fibers. Spindle fibers are attached to the centromere of a chromosome. The chromosomes are arranged on the equatorial plane. The process of gathering of chromosomes in equator is called congressional and plate formed is called metaphasic plate.

iii. Anaphase:-

The centromere of each chromosome splits into two sister chromatids and forms two daughter chromosomes. The daughter chromosomes are pulled towards the poles due to the contraction of spindle fibres and stretching of interzonal fibers. During polar movement, the chromosomes show different shapes i.e. J, U, V, L or I shaped in appearance. At the end of anaphase, each pole will get one set of daughter chromosomes. It is the shortest phase and is also known as a migratory phase.

iv. Telophase:- The daughter chromosomes reach respective poles and uncoil and become thin, long and visible. The spindle fibres start disappearing and finally disappear. The nuclear membrane and the nucleolus reappear.

Two nuclei are formed at the end of telophase. Both the nuclei have the same number of chromosome as the parent cell. It is the last visible stage of karyokinetic and is also known as reorganization phase.

It is followed by cytokines or division of cytoplasm.

Explanation:

5 0

2 years ago