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katrin2010 [14]
3 years ago
8

Can someone pls help me

Biology
1 answer:
ExtremeBDS [4]3 years ago
6 0

Hey, do you have the answer to this question?

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How many megaspores and how many sperm cells are involved in a double fertilization event?.
KIM [24]

Explanation:

In the megasporan- gium of each ovule, the megasporocyte divides by meiosis, producing four megaspores. One survives and forms a female gametophyte. Fertilization: In nucleus of developing endosperm-- Double fertilization occurs. One sperm fertilizes the egg, forming a zygote.

7 0
2 years ago
Which of the following organisms have existed on Earth for the longest period of time?
balandron [24]

Answer:

single-celled organisms

Explanation:

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Part A If you want to affect chromatin packaging, which amino acid could you mutate to affect both histone acetylation and methy
attashe74 [19]

Answer:

Lysine

Explanation:

lysine residues on the histone tails of the octamer cn be activated by both acetylation and methylation patterns to influence accessibility or silencing of the genes respectiviely. for example, acetylation of H3K27 (histone 3 lysine residue 27) brings about a region of active chromatin allowing access to transcription activity while its trimethylation  will cause silencing of the associated gene at that particular area (no expression of that gene)

5 0
2 years ago
Chromosome.
Mashcka [7]

Answer:

1. x chromosome

2.males

3.one X and one Y chromosome.

4. two X chromosomes

5. a very common trait in humans and frequently used to explain X-linked disorders.[8] Between seven and ten percent of men and 0.49% to 1% of women are affected. Its commonness may be explained by its relatively benign nature. It is also known as daltonism.

6.Females with one copy of the mutated gene are carriers. X-linked inheritance means that the gene causing the trait or the disorder is located on the X chromosome. Females have two X chromosomes while males have one X and one Y chromosome.

Explanation:

4 0
3 years ago
In which step of the scientific method is information obtained through the scenes?
andre [41]
Cnduct an experiment
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