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3 years ago

Why is meiosis necessary for multicellular organisms?

2 answers:

6 0

Meiosis occurs in diploid cells (2n) as they get ready to reduce the amount of genetic information they carry down to the haploid state (n). This is vital preparation for many kinds of sexual reproduction, and in diploid multicellular organisms it occurs in specialized, gamete producing parts of the body called gonads.

irga5000 [103]3 years ago

4 0

Answer:

Let’s start off by explaining meiosis and what it entails. Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction. During reproduction, when the sperm and egg unite to form a single cell, the number of chromosomes is restored in the offspring.

Why is meiosis biologically important?

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Meiosis is a fundamental step in sexual reproduction. All eukaryotes (that is, all animals, plants, fungi, and other non-bacteria) reproduce by recombining their genes with the genes of another organism of the same species. This is fundamental to the process of evolution, because it allows for millions of different genetic combinations to be tried out within each generation and for any genetic variants which have a survival advantage to spread throughout the population.

Without sexual reproduction, each offspring is a clone of its single parent. It may accumulate a few mutations, most of which

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Four possible biological functions of meiosis are considered. First, the conventional view that it generates by recombination and sexual reproduction the genetic diversity on which natural selection can act. Second, that recombination at meiosis plays an important role in the repair of genetic defects in germ line cells. Third, that it is essential, at least in animals, for the reprogramming of gametes which give rise to the fertilized egg. Fourth, that it helps maintain the immortality of the germ line, possible by a process of rejuvenation involving the removal of faulty RNA and protein molecules, or by the elimination of defective meiocytes.

Meiosis is important because it ensures that all organisms produced via sexual reproduction contain the correct number of chromosomes. Meiosis also produces genetic variation by way of the process of recombination.

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3 years ago

In plants and animals, sexual reproduction causes variation

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The answer is C, because if something contagious we’re to threaten the population of the species then not having any variant means they’re all the same and it would kill them all and cause them to go extinct

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3 years ago

A vestigial-winged, hairy male is crossed with a wild-type female, homozygous at both genes. This F1 generation is crossed to pr

loris [4]

Answer:

The expected proportion of F2 individuals which are homozygous recessive at both genes is 1/16

All of the F1 generation will have the normal phenotypes for both genes

There will be no homozygous individuals in the F1 generation

Most of the F2 generation will have the normal phenotypes for both genes

Explanation:

A winged hairy male is crossed with a wild type female which is homozygous

Let the allele for vestigial trait be v

allele for wild trait be w

allele for hairy trait be h

Allele for non hairy be n

The genotype of parents would be

vvhh * wwnn

Thus in F1 generation all the offsrping will have normal phenotypes for both genes

In F2 generation

vwnh * vwnh

Out of 16 offspring only one wil be homozygous recessive i,e

wwnn

Rest all 15 will have normal phenotypes.

Hence, the correct answer is

The expected proportion of F2 individuals which are homozygous recessive at both genes is 1/16

All of the F1 generation will have the normal phenotypes for both genes

There will be no homozygous individuals in the F1 generation

Most of the F2 generation will have the normal phenotypes for both genes

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4 years ago

Small structures inside cells that perform specific functions are called:

frosja888 [35]

Answer:

B. Organelles

Explanation:

they are called

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