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neonofarm [45]
3 years ago
11

2. A likely explanation for an abnormal human phenotype associated with a trisomy is: A) the presence of multiple recessive muta

nt alleles. B) the extra chromosome has typically undergone significant rearrangements. C) the absence of genes necessary for certain cellular processes. D) altered gene dosage (also known as genetic balance). E) the random inactivation of a complete autosome.
Biology
1 answer:
KATRIN_1 [288]3 years ago
4 0

Answer:

The correct answer is B the extra chromosome has typically undergone significant rearrangements.

Explanation:

Trisomy is a type of aneuploidy which is characterized by the presence or occurance of an extra copy of a particular chromosome.As a result the chromosomes in which the trisomy is occurring contain 3 arms instead of 2. Trisomy occur due to non disjunction  of a particular chromosome during meiosis.

 As a result a second copy of chromosome is present inside the cell containing that abnormal chromosome.If the same thing occur in the cell of gamet undergoing fertilization then there is a high chance that the embryo will carry that extra chromosome.

 In case of humans  Trisomy result in the rearrangement extra chromosome which ultimately give rise to

1 Trisomy 18 occur due to extra copy of chromosome no 18

2 Trisomy 13 occur due to extra copy of chromosome no  13

3  Trsomy 21 occur due to extra copy of chromosome no  21  which is also called down syndrome.

 

   

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D - Telophase
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Answer:

A-B-C-D

Explanation:

PROPHASE; 1. chromosomes become thicker

2. nuclear membrane disintegrates

3. centrosome divide to form centrioles

4. centrioles move to the opposite polls of the cell

METAPHASE; 1. chromosomes get arranged at the equator

2. centrioles produce spindle fibre that attach to the middle of the chromosomes

ANAPHASE; 1. shortest stage of mitosis

2. spindles will pull apart each chromosomes to form chromatids

TELLOPHASE; 1.  each chromatid moves to opposite polls of the cell

2. nuclear membrane appears around both of them

3. the centrioles sill stop producing spindles

4. centrosomes will then form again

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7 0
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The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. The ancient whale is extinct and is bel
bezimeni [28]

Answer: It shows the evolution of mutations. Throughout the lifetime of animals and humans depending on their way of life and how they life it they will slowly mutate into a different animal to be able to life that way..

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