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3 years ago

What are known causes of epigenetic effects, and how do they

Biology

1 answer:

OverLord2011 [107]3 years ago

4 0

Answer:

Epigenetic effects can be caused by DNA heterochromatin and/or histone silence or activate.

As such, they can different chromosomes or certain chromosomal regions and be responsible for parental imprinting or influencing gene activity in oxidation and reduction.

Patterns of nucleotide demethylation and hypermethylation are often activate when cancer cells are compared to normal cells.

Explanation:

Cells acquire various patterns of gene expression during differentiation to adapt to a changing environment. Epigenetic and genetic alterations are considered as two independent mechanisms that participate in the onset and progression of cancer. Epigenetic mechanisms can be as important for biological events as genetic mechanisms, which do not imply a change in the DNA sequence, but do have an important role in the modification of gene expression.

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Why are there more herbivores than carnivorous in a typical ecosystem?

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4 years ago

A difference between monocot and dicot angiosperm flowers that can help identify them is that dicots A. Grow flowers with petals

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That would be A.

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Minerals that are heavy, durable, and chemically resistant are likely to be found in _____ deposits.

Katen [24]

Minerals <span>that are heavy, durable, and chemically resistant are likely to be found in placer deposits. A placer deposit </span><span>is an accumulation of valuable minerals</span>

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3 years ago

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Two dihybrid pea plants (both tall and with purple flowers) are mated. The cross resulted in 9866 progeny, of which 5550 were ta

d1i1m1o1n [39]

Answer:

<h2>616 Short with white flower </h2><h2>1850 Tall with white flower </h2><h2>1850 Short with purple flower</h2>

Explanation:

A dihybrid cross is in which two genes of two different traits are crossed

As given, two dihybrid pea plants (tall with purple flower) are mated, resulting 5550 out of 9866 were tall with purple.

T= tall

t= short,

P= purple,

p= white;

So genotype of parents are TtPp ; T is dominant over t, P is dominant over p.

Crossing between two parens= TtPp × TtPp

so gamets are = parent 1: TP, Tp, tP, tp and parent 2: TP, Tp, tP, tp

Hence the four different gametes formed.

Now arrange the gametes on the top and left side of a Punnett square it'll genotypically results into different combinations, by which phenotypic ratios can be calculated.

offspring are = TTPP, TTPp, TtPP, TtPp....................TTpp, Ttpp.....ttPP, ttPp.......ttpp

(T_P_)= Tall with purple flower,

(T_pp)= tall with white flower,

(ttP_)= short with purple flower,

(ttpp)= short with white flower.

so it show 12:3:3:1 ratio'

Phenotypic classes are:

616 Short with white flower

1850 Tall with white flower

1850 Short with purple flower

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3 years ago