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mart [117]
4 years ago
12

The earliest routine prenatal test is a first-trimester screen, which is usually done in the 11th to 13th week of pregnancy. it

includes a blood test and _____.
Biology
1 answer:
mash [69]4 years ago
4 0
A Outré sound might be the answer
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Which explanation below best describes why meiosis produces haploid cells?
Agata [3.3K]

Answer:

Egg and sperm cells have to have half the number of chromosomes as in  body cells so when they combine to form a zygote, the zygote is diploid  and has the correct number of chromosomes. This explanation describes why meiosis produces haploid cells.

Explanation:

Meiosis is a type of cell division in which four haploid cells are produced from a diploid parent cell having two copies of each chromosome, where the number of chromosomes in the parent cell is reduced to half by undergoing DNA replication and nuclear division. Diploid cell contains two copies of each chromosome, one inherited from mother and the other from father while haploid cell contains only one copy of each chromosome. Examples of diploid cells (somatic cells) are skin, blood, muscle cells etc. Eggs or ovum (female gametes) and sperm (male gametes) are haploid reproductive cells. If the total number of chromosomes in a diploid cell is represented as '2n', then the number of chromosomes in a haploid cell is 'n'.  During the fertilization process in an organism, the correct number of chromosomes is restored when the haploid male and female gamete combined to form a single diploid zygote, which is the first developmental stage of an organism.

7 0
3 years ago
If a woman with type a blood has a baby with type ab, a man with type o ____ would be the father
Leni [432]

Answer:

if a woman with type a blood has a baby with type ab, a man with type <u>ob </u>would be the father

Explanation:

hope this helps! :)

6 0
2 years ago
Actual age refers to the relative age, while comparison age refers to absolute age. True or False?
kykrilka [37]
The answer is false.
7 0
3 years ago
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The tissue that carries electrical message throughout the body is _____ tissue.​
irina1246 [14]

Answer:

the tissue that carries electrical message throughout the body is bad tissue.​

7 0
3 years ago
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The most abundant gas in the modern atmosphere is
777dan777 [17]

Answer

nitrogen

Explanation

The most abundant gas is nitrogen followed by oxygen and argon

3 0
3 years ago
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