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Romashka [77]
3 years ago
6

In the process of embryonic development, which stage comes first?

Biology
2 answers:
REY [17]3 years ago
6 0

Ans.

Embryogenesis or embryonic development is defined as a process that involves formation and development of a zygote into embryo. The fertilized egg or zygote undergoes mitotic divisions through cleavage and divides rapidly.

The first stage of embryonic development is known as morula that represents a 16 cells consisting solid ball-like structure. The morula later develops into blastula.

Thus, the correct answer is option C). 'morula.'


velikii [3]3 years ago
4 0
I think b but i could be wrong
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Sholpan [36]

Heterozygous Red- Rr

Homozygous Red-- RR

Homozygous white-- rr

Monohybrid cross- Rr

Recessive allele- homozygous white i.e rr

Explanation:

Heterozygous have 2 different alleles of a gene as both Red and white alleles are present in the example Rr.

Homozygous: If the 2 alleles at a locus is same then they are homozygous, it can be dominant as RR or recessive as rr.

Recessive gene are the ones that can be masked by the dominant genes as red is dominant on white.

Monohybrid cross is the result of cross between the individual having either homologous dominant or recessive genes or genotype. The result is generally masking the recessive allele resulting in dominant phenotypic trait but the genotype changes.

From the example given in question:

A cross between dominant red as RR

and a cross between recessive white as rr

The punnet square shows:

  r     r

R Rr  Rr

R Rr   Rr

it can be seen that all progeny are red but genotype changed to heterozygous red as Rr

7 0
3 years ago
Select the difference between prokaryotes and eukaryotes.
Lana71 [14]

Eukaryotic cells are larger than prokaryotic cells and have a “true” nucleus, membrane-bound organelles, and rod-shaped chromosomes. The nucleus houses the cell's DNA and directs the synthesis of proteins and ribosomes.

So..the answer should be D. Eukaryotic cells have a true membrane-bound nucleus and prokaryotes do not

All cells have a plasma membrane, ribosomes, cytoplasm, and DNA. Prokaryotic cells lack a nucleus and membrane-bound structures. Eukaryotic cells have a nucleus and membrane-bound structures called organelles.

So..it can't be C. or A. or even B.

Correct me if I'm wrong.

8 0
3 years ago
Read 2 more answers
Help?
german
<span>b.)The mRNA code determines which tRNA molecules are used. 

</span><span>D. Ribsome

</span><span>A. Meothionine, Serine, Glutamine, Tryptophan</span>

6 0
3 years ago
Read 2 more answers
What system creates coordinates based on a flat map, instead of a globe?
krek1111 [17]

Answer:

the answer is C

Explanation:

The Universal Transverse Mercator coordinate system is a global system of grid-based mapping references

6 0
3 years ago
Which activity can occur without the use of energy?
miv72 [106K]
The movement of water across a membrane.
7 0
4 years ago
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