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2 years ago

Occasionally a child is born with an extra chromosome 13, but never do you see a child with an extra chromosome 12, why?

1 answer:

3 0

This is because some of the trisomies (one extra chromosome, three instead of two) are fatal, births cannot survive.

Theoretically, trisomies can occur with any chromosome, but often result in miscarriage.

The types of autosomal trisomy that survive to birth in humans are:

Trisomy 8 or Warkany syndrome 2

Trisomy 9

Trisomy 13 or Patau syndrome

Trisomy 18 or Edwards syndrom

Trisomy 21 or Down syndrome.

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Camel humps are an adaptation for _______.. a.. storing water. b.. regulating body heat. c.. carrying riders. d.. all of the abo

Fofino [41]

The correct answer is:

b regulating body heat.

Explanation:

Camels have humps on their backs as rooms to store fat. It is this fact that they live off when food and liquid are scarce. A well-fed camel in good shape has a firm, upright hump. After a long, exhausting wilderness journey the corresponding camel will have a hump that does floppy and bent over to one side.e. Concentrating body fat in their humps reduces heat-trapping.

6 0

3 years ago

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In my research, i found that the levels of "gonadotropins" in the body are critical to understanding how the drugs clomid and or

madreJ [45]

Answer:

Gonadotropins are polypeptide hormones and are secreted by the anterior pituitary gland.

Explanation:

Hypothalamus releases GnRH i.e gonadotropin releasing hormone which stimulates the anterior pituitary to secrete gonadotrophs such as FSH, ICSH and LH.

FSH (follicle stimulating hormone): In males it stimulates spermatogenesis. In females it stimulates growth of ovarian follicles.

ICSH (Interstitial cell stimulating hormone): In males, secretion of testosterone.

LH (Luteinising hormone): In femalestogether with FSH, it triggers ovulation, stimulates conversion of broken ovarian follicle into corpus luteum.

3 0

3 years ago

Read 2 more answers

Water boiling is an example of a _____.

coldgirl [10]

Physical change. Boiling water does not change the fundamental properties of the water, as it can turn back into water during condensation.

7 0

3 years ago

^^^biology question

nevsk [136]

Answer:

A 40 percent

Explanation:

If guanine is 10 percent this means that cytosine will also be 10.thats a total of 20 percent. We will then have 80 percent remaining for thymine and adenine. As we know adenine make a bond with thymine so 80 divide by 2 is 40 percent for each

8 0

2 years ago

Analyze the diagram below. Which of the following is true about the sodium (Na) atom after the electron moves to chlorine?

miv72 [106K]

Answer:

B. It becomes a positive ion.

Explanation:

The number of electrons and protons is eleven in sodium. After sodium (Na) has transferred its electron to the chlorine atom (Cl) it becomes a positively charged ion. This is because as electrons are negatively charged, losing of an electron will increase the number of protons (i.e 11) as compared to the number of electrons (i.e 10) in sodium (Na) atom. Hence, a positive charge will be acquired by the sodium (Na) ions.

8 0

3 years ago