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2 years ago

Some genes are important enough to be called "molecular switch" or "master" genes. What is the purpose of these genes?

Biology

1 answer:

trapecia [35]2 years ago

4 0

Answer:

Genes called "molecular switch" or master genes have the purpose of control when other genes are expressed (option A).

Explanation:

Master gene is so named because it has the function of controlling the behavior of other genes, organizing their functions and regulating when they can be expressed.

The name of molecular switch is synonymous with the master gene, since its activation determines the genetic regulation necessary to establish cell differentiation and even the determination of the sex of some species.

The other options are not correct because:

B. Master genes do not determine the organization of the genome .

C. Regulation of cell metabolism depends of substances as hormones and enzymes.

D. The rate of translation does not depend on the activity of master genes.

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If the expression of every gene depends on a set of transcription regulators, then the expression of these transcription regulat

Scorpion4ik [409]

Answer:

Transcriptional regulators function to regulate the expression of different genes and also to affect the expression of other transcriptional regulators, thereby the combination of a few transcriptional regulators is sufficient to modulate gene expression patterns

Explanation:

Transcriptional regulators are able to control gene expression by binding to cis-regulatory elements on the genome. For example, in plants, MADS-box proteins are transcriptional regulators that contain an evolutionary conserved DNA-binding domain (i.e., MADS-box domain) which regulate simultaneously the expression of many different genes by binding to a conserved DNA motif called CArG box [CC(A/T)6GG] located in the promoter region of many genes expressed at specific stages of plant development. Within the cell, transcription regulators function not only by controlling the expression of different genes but also by affecting each other's activity, thereby creating different combinations where the expression of a limited number of transcription regulators is sufficient enough to regulate gene expression patterns.

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3 years ago

In tomato plants, the allele for purple stems is dominant to allele for green stems and the allele for red fruit is dominant to

Kamila [148]

So let's call the allele that is dominant for purple stems is P, and the recessive allele yielding green stems is p. And let's say that the allele that is dominant for red fruit is R and the recessive allele for yellow fruit is r.

The two plants are each heterozygour for both traits, meaning that the cross is going to be:

PpRr x PpRr

So let's setup a Punnet Square:

$\left[\begin{array}{ccccc}&PR&Pr&pR&pr&PR&PPRR&PPRr&PpRR\4&PpRr&Pr&PPRr&PPrr&PpRr&Pprr\\pR&PpRR&PpRr&ppRR&ppRr&pr&PpRr&Pprr&ppRr&pprr\end{array}\right]$

The genotypic ratios (alleles) and phenotypic ratios are as follows:

PPRR (Purple stem, Red fruit): $\frac{1}{16}$

PpRR (Purple stem, Red fruit): $\frac{2}{16}$ or $\frac{1}{8}$

ppRR (Green Stem, Red fruit): $\frac{1}{16}$

PPRr (Purple stem, Red fruit): $\frac{2}{16}$ or $\frac{1}{8}$

PPrr (Purple stem, Yellow fruit): $\frac{1}{16}$

PpRr (Purple stem, Red fruit): $\frac{4}{16}$ or $\frac{1}{4}$

pprr (Green stem, Yellow fruit): $\frac{1}{16}$

ppRr (Green stem, Red fruit): $\frac{2}{16}$ or $\frac{1}{8}$

Pprr (Purple stem, Yellow fruit): $\frac{2}{16}$ or $\frac{1}{8}$

So then we take the like phenotypic ratios and add them together:

Purple stem, Red fruit: $\frac{1}{16} +\frac{2}{16} +\frac{2}{16} +\frac{4}{16}=\frac{9}{16}$

Green stem, Red fruit: $\frac{1}{16}+ \frac{2}{16} =\frac{3}{16}$

Purple stem, Yellow fruit: $\frac{1}{16}+ \frac{2}{16} =\frac{3}{16}$

Green stem, Yellow fruit: $\frac{1}{16}$

6 0

3 years ago

A feral cat needs to eat two mice a day to survive. A mouse needs to eat 5 seeds a day to survive. How many seeds are required t

Mars2501 [29]

Answer:

70 seeds

Explanation

5 is the food for a mouse (day)x2 mice for cat=10. 10x7(week)=70 seeds

hope this helps!

3 0

3 years ago

A type of plant that produces red flowers is crossed with a plant that produces white flowers. The alleles for flower color exhi

Illusion [34]

The answer is 25% red : 50% pink : 25% white

A - allele for red flowers
a - allele for white flowers

AA - flowers with red flowers
Aa - flowers with pink flowers
aa - flowers with white flowers

The cross looks like:
Parents: Aa x Aa
Offspring: AA Aa Aa aa

Red flowers (AA): 1/4 = 0.25 = 25%
Pink flowers (Aa): 2/4 = 0.50 = 50%
White flowers (a): 1/4 = 0.25 = 25%

8 0

3 years ago

Read 2 more answers

A population of sixteen lizards live in the tropical archipelago shown here. During one

Tju [1.3M]

Answer:

Explanation:

16/2=8

8+10+10=28

28-2=26

26-2=24

8 0

3 years ago