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Kryger [21]
3 years ago
9

Describe the process and end result of meiosis.

Biology
2 answers:
Romashka-Z-Leto [24]3 years ago
6 0

Answer: In humans, meiosis is the process by which sperm cells and egg cells are produced. In the male, meiosis takes place after puberty. Diploid cells within the testes undergo meiosis to produce haploid sperm cells with 23 chromosomes. A single diploid cell yields four haploid sperm cells through meiosis. In females, meiosis begins during the fetal stage when a series of diploid cells enter meiosis I. At the conclusion of meiosis I, the process comes to a halt, and the cells gather in the ovaries. At puberty, meiosis resumes. One cell at the end of meiosis I enters meiosis II each month. The result of meiosis II is a single egg cell per cycle (the other meiotic cells disintegrate). Each egg cell contains 23 chromosomes and is haploid. The union of the egg cell and the sperm cell leads to the formation of a fertilized egg cell with 46 chromosomes, or 23 pairs. Fertilization restores the diploid number of chromosomes. The fertilized egg cell, a diploid, is a zygote. Further divisions of the zygote by mitosis eventually yield a complete human being.

Sladkaya [172]3 years ago
6 0

Answer:

In meiosis-II the separation of two chromatids occur so that equal number of chromatids (in fact chromosome due to duplication of genetic material) goes to each of the daughter cell. Thus, at the end of meiosis-II, four daughter cells are formed. Each cell has half the number of chromosomes present in the diploid cell.Feb

Explanation:

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Answer:

a and b

Explanation:

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Which hip bone forms the superioir part of the pelvic girlde that extends upward from the acetabulum
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The ischium bone forms the superior part of the pelvic girdle.

<h3>What is the structure of the pelvic girdle?</h3>

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3 0
2 years ago
A population of crabs living on a sandy beach exhibits three colors: dark brown, light
PolarNik [594]

Answer:

100% of the progeny will be speckled

Explanation:

<u>Available data:</u>

  • Three colors: dark brown, light  brown, and speckled.
  • The genotypes for these colors are BB for dark brown, bb for light brown, and Bb for speckled.

Cross: dark brown crab  with a light brown crab

Parentals) BB     x     bb

Gametes) B   B        b    b

Punnett square)

                     B        B

            b      Bb      Bb

             b     Bb      Bb

F1) Genotype:

     4/4 = 100% of the progeny will be heterozygous for the trait, Bb

     Phenotype:

    4/4 = 100% of the progeny will be speckled

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