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Ch. 27 The Reproductive System
Marieb - Human Anatomy & Physiology 11th Edition
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034Not the one you use?Change textbook
All textbooksMarieb, Hoehn 11th EditionCh. 27 The Reproductive SystemProblem 1
Chapter 27, Problem 1

The normal diploid number of human chromosomes is:
a. 48
b. 47
c. 46
d. 23
e. 24

Verified step by step guidance
1
Understand that the diploid number refers to the total number of chromosomes present in a typical somatic (body) cell, which includes two sets of chromosomes—one set inherited from each parent.
Recall that humans have 23 pairs of chromosomes, meaning each pair consists of two homologous chromosomes.
Calculate the total number of chromosomes by multiplying the number of pairs by 2: \(23 \times 2\).
Recognize that this total represents the diploid number, which is the standard chromosome count in human somatic cells.
Compare the calculated diploid number to the options provided to identify the correct answer.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Diploid Number

The diploid number refers to the total number of chromosomes present in a typical somatic cell of an organism, containing two sets—one from each parent. In humans, this number represents paired chromosomes, essential for maintaining genetic stability across generations.
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Introduction to Cell Division

Human Chromosome Count

Humans normally have 46 chromosomes in their somatic cells, arranged in 23 pairs. This includes 22 pairs of autosomes and one pair of sex chromosomes, which determine biological sex. This count is fundamental to human genetics and cell biology.
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Introduction to Human Development

Haploid Number

The haploid number is the number of chromosomes in gametes (sperm and egg cells), which is half the diploid number. For humans, the haploid number is 23, ensuring that upon fertilization, the diploid number of 46 is restored.
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Meiosis II
Related Practice
Textbook Question

Relative to differences between mitosis and meiosis, choose the statements that apply only to events of meiosis:

a. Tetrads present

b. Produces two daughter cells

c. Produces four daughter cells

d. Occurs throughout life

e. Reduces the chromosomal number by half

f. Synapsis and crossing over of homologous occur

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Textbook Question

The usual site of embryo implantation is:

a. The uterine tube

b. The peritoneal cavity

c. The vagina

d. The uterus

Textbook Question

The structures that draw an ovulated oocyte into the female duct system are:

a. Cilia

b. Fimbriae

c. Microvilli

d. Stereocilia