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Firdavs [7]
3 years ago
5

Mary is pregnant with her first child and has recently had genetic testing to determine whether her baby-to-be is growing normal

ly. Among other things, her test results indicate that the twenty-third chromosome pair of her fetus includes one X chromosome and one Y chromosome. This means that:
a. Mary is expecting a girl.
b. Mary is expecting a boy.
c. Mary’s baby will have Down syndrome.
d. Mary’s baby has a 50-50 chance of having Klinefelter syndrome.
Biology
1 answer:
maks197457 [2]3 years ago
8 0

Answer:

b. Mary is expecting a boy.

Explanation:

Sex determination in human follows the XX-XY mechanism wherein the human males have one copy of X and one copy of Y chromosomes as their sex chromosome. So, the human males have a total of 22 pairs of autosomes and one copy of each X and Y chromosomes as the 23rd pair.  

The human females have 22 pairs of autosomes and one pair of X chromosomes as the 23rd pair.  

If the genetic testing shows the presence of one copy of each X and Y chromosomes in the 23rd pair of chromosome in the fetus, the fetus is going to develop into a baby body.  

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hi there

the answer to this is

Only individuals with an aa phenotype will the express a recessive trait; therefore,the offspring must have receive one recessive allele from each parents to exhibit a recessive trait. One example of a recessive inherited trait is a smooth chin, the  Domnait allele is the  cliff chin

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4 years ago
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Answer:

A. Fish need light to see their food

Explanation:

B is incorrect because fish take in oxygen constantly to respirate. If they only took in oxygen when it was dark they would die.

C is incorrect because expelling CO2 is also a constant process as a part of the reactions that take part inside living organisms, so it happens constantly (a bit like B)

D is incorrect because plants need light for food (photosynthesis) and would most likely die or have stunted growth if left in the dark.

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3 years ago
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In the given situation, a bar graph indicating average high and low temperatures for Amanda’s area in the autumn, winter, spring, and summer would be an effective scientific model to be incorporated in the Amanda project. This is because of the fact that both independent and dependent variables can be analyzed by this way. The temperature is an independent variable, which changes with respect to the climatic conditions, which represent a particular season like autumn, winter, spring and summer which is a dependent variable.

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