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Lynna [10]
3 years ago
7

HELP NEEDED!¡!!!!!!!

Biology
2 answers:
hram777 [196]3 years ago
8 0

Okay, I'm not entirely sure but I think the answer is C.

nadezda [96]3 years ago
3 0

b is the answer hope this helped

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Which of the following phases is the first <br> step in mitosis?
Reika [66]

Answer:

prophase is the first phase

Explanation:

PMAT

PROPHASE

METAPHASE

ANAPHASE

TELOPHASE

8 0
3 years ago
A woman, S.R., had a maternal grandfather with hemophilia A (OMIM 306700), an X-linked recessive condition that reduces blood cl
Sidana [21]

Answer:

Hemophilia is a x-linked recessive inherited bleeding  disorder. in this disease blood does not clot properly due to the decreased level of blood clotting factor VIII (8) or factor IX (9).

In x-linked recessive condition, the disease is transmitted from father (affected male) to his daughter and mother (affected female) to her son and skip of generation getting affected is also occurs.

  • there will be 50% chance of her (S.R.) each son to be affected with hemophilia.

Explanation:

Hemophilia is caused due to mutation of one gene which is responsible for the making of proteins of  blood coagulation factor viii or ix. the affected person bleeds continuously from any injury and that can cause serious issues.

here,

grandfather of s.r is affected (xₐy) and grandmother is normal (xx) will produce

                                                   ↓

 s.r's mother who is a carrier (xₐx) [as xₐy and xx will produce 100% carrier xₐx daughter]

                                                    ↓

s.r's mother is a carrier (xₐx) but her father is normal (xy) will produce,

                                                   ↓

s.r who has 50% chance of being carrier (xₐx) and 50% chance of being normal (xx) [as she is the only child] and she has a normal (xy) partner, they will give,

                                                     ↓

  1. if s.r is a carrier (xₐx) then one of her son will be affected (xₐy)   [as xₐx and xy =xₐy]
  2. if s.r is normal (xx) then her son will be normal (xy) [as xx and xy will give xy]

here,<u> 50% chance of her son to be affected with hemophilia</u> [as S.R of being affected is more considerable].

8 0
3 years ago
Which of the following is not characteristic of smooth muscle? A) The striations are due to the orderly arrangement of actin and
Tems11 [23]

Answer:

A) The striations are due to the orderly arrangement of actin and myosin

Explanation:

Smooth muscles are non-striated involuntary muscles which are found in the walls of stomach, urinary bladder, blood vessels...Smooth muscle tissue is composed of spindle-shaped muscle cells with single central nucleus. Like the other two type of muscles (cardiac and skeletal), smooth muscles also have four main functions:

  • Contractility-ability to contract. In the case of skeletal muscles it is voluntary, while in cardiac and smooth muscles it is unconscious.
  • Excitability-ability to change  membrane potential usually by the influence of nervous impulse.
  • Extensibility-the capacity to lengthen
  • Elasticity-ability to change its length and then return to previous.

7 0
3 years ago
In your lab you are studying the genome of venomous rattlesnakes to find the gene which codes for their venom glands. One rattle
gogolik [260]

Answer:

I believe your answer is inversion. Hope this helps.

4 0
3 years ago
What was Marshall Nirenberg and Heinrich Matthaei’s contribution to our current understanding of the genetic code
murzikaleks [220]

Answer:

Answer: The correct answer is discovery of codons. Marshall Nirenberg and Heinrich Matthaei experimentally deciphered the first out of 64 codons present in our biological system. ... So, it helped in decoding the first codon out of 64.

Explanation:

3 0
3 years ago
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