1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
aliina [53]
3 years ago
8

Contrast the genetic content and the origin of sister versus nonsister chromatids during their earliest appearance in prophase I

of meiosis. How might the genetic content of these change by the time tetrads have aligned at the equatorial plate during metaphase I?
Biology
1 answer:
Bogdan [553]3 years ago
7 0

Answer:

<u>Sister chromatids are identical  forms of chromatids  of a chromosomes. They are mostly  formed by semi-conservative replication of DNA molecule of a single  chromosome.Thus they  are  like  </u><u>'photocopies' </u><u> of  original parent  chromosomes; joined together at the Centromere</u>.

They are exactly similar in all ramification; with the same gene and allele compositions..

<u>However; slight differences  arise between the two identical sisters due to  </u><u>mutation</u><u> from</u><u> errors </u><u>at replication;and also in  the  length of telomere repeats.</u>

Non-sister chromatids are dissimilar forms of  chromatids of a chromosomes formed  when each half of  a chromosome  at fertilisation from separate   haploid sex-cells, of each parent. fused.They contain different genetic composition;because  they are not on the same homologous chromosomes.Therefore crossing -over ensure variation.

<u>However, they are genetically  similar in composition; if they  are contained in homologous chromosomes</u>. This is because Synapsis of bivalent of these chromosomes allow genetic material to be shared by  chromosomal crossing-over between the non-sister chromatids  on the chromosomes ; therefore identical genetic characteristics are shared .

Explanation:

You might be interested in
The brain coordinates the physical changes that occur during puberty and the ______ plays an especially important role in this p
levacccp [35]

Answer: Hypothalamus

The brain coordinates the physical changes that occur during puberty and the hypothalamus plays an especially important role in this process.

Explanation:

Since the hypothalamus controls the secretion of hormones from the pituitary gland, and the pituitary gland, also known as master gland, controls the activities of all other glands like the following:

- gonads (ovaries and testes), responsible for producing many of the sex hormones and hence, development of sexual characterictics

- thyroid, responsible for producing thyroxine, responsible for body metabolism and development.

Thus, hypothalamus plays important role in puberty

4 0
3 years ago
Opsins are proteins that are found in the light-sensing cells in the human eye. Different opsin proteins are sensitive to differ
Zepler [3.9K]

Answer:

Women who carry one copy of the mutated gene still have normal color vision because they have another copy, which is not mutated, in the other X chromosome that will be the dominant one. As a result, the women are carriers of the mutated gene but not color blind.

Explanation:

Colorblindness is a sex-linked mutation. A woman has two X chromosomes, while a man has one X chromosome and one Y chromosome. The mutated gene that causes color blindness is on the X chromosome, and it is OPN1LW. So if a woman has one mutated OPN1LW in one of her two X chromosomes, the OPN1LW gene in the other X chromosome will be the dominant one stopping the woman from being colorblind.

In the case of men, as they only have one X chromosome, if there is a mutation on the OPN1LW in the X chromosome, the men will be colorblind because there is no extra copy of the gene, as it is in women.

6 0
3 years ago
In human beings, the statistical probability of getting either a male or female child is 50:50. Give a suitable explanation.​
suter [353]

Answer:

There is 50 chance because there are two chromosomes that are same and two which are difeerent . XX MEANs girl XY means boys .

3 0
2 years ago
Read 2 more answers
What is the human female reproductive system is adapted for? A. Production of zygotes in ovaries B. External fertilization of ga
victus00 [196]

Answer:

D. Transport of oxygen through a placenta to a fetus.

Explanation:

Zygotes are fertilized egg cell, zygotes aren't produced in the ovaries but ovums or egg cells are produced in the ovaries. So option A is false.

Fertilization is internal not external in human. Option B is wrong.

Production of milk happens in the mammary gland (the breast) not in the reproductive system. Option C is false.

Transport of oxygen through a placenta to a fetus. The placenta is a vascular organ which is implanted in the wall of the uterus (a part of the female reproductive system) and links to the foetus through the umbilical cord.

8 0
3 years ago
If the organisms on the third trophic level have 360cal of energy, how much energy is present in the producers on the first trop
Law Incorporation [45]

Answer:

120 cal of energy

Explanation:

6 0
3 years ago
Other questions:
  • Advantages of cutting crops with sickle?​
    10·1 answer
  • What is most likely the result of genetic engineering
    10·2 answers
  • What can we learn from starting the work of others
    13·1 answer
  • which of these is an environmental effect of farming A. soil erosion B. tempature increase C. natural disasters D. habitat succe
    13·2 answers
  • What are 3 terms used to describe organisms such as trees
    9·1 answer
  • A group of researchers discovered the fossilized remains of a flying mammal that appears to have lived 130 million to 165 millio
    14·1 answer
  • I neeeeeeed help hurrrryyyy
    5·2 answers
  • Events that involve matter and energy. Which events can you explain? Which events can’t you explain?
    13·1 answer
  • During pregnancy, a fetus gets oxygen and nourishment via the
    14·1 answer
  • What’s a convection current and how is it caused?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!