Textbook Question
An allele is a .
a. version of a gene;
b. dysfunctional gene;
c. protein;
d. spare copy of a gene;
e. phenotype
1062
views
Fertility
Chapter 7, Problem 8
If humans have 23 pairs of chromosomes, each carrying hundreds to thousands of genes, roughly how many genes are there in the human genome? a. 23; b. 46; c. 1000; d. 20,000; e. 200,000
Verified Solution
Video duration:
3m
This video solution was recommended by our tutors as helpful for the problem above.Was this helpful?
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Chromosomes
Chromosomes are long, thread-like structures made of DNA and proteins that contain genetic information. In humans, there are 23 pairs of chromosomes, totaling 46, with each chromosome carrying numerous genes that dictate various biological functions and traits.
Recommended video:
Guided course
08:09
Homologous Chromosomes
Genes
Genes are segments of DNA that serve as the basic units of heredity. They encode instructions for the synthesis of proteins, which perform most life functions. The human genome is estimated to contain approximately 20,000 to 25,000 genes, which contribute to the complexity of human biology.
Recommended video:
Guided course
05:02Genes & Alleles
Human Genome
The human genome is the complete set of genetic information for humans, consisting of all the genes and non-coding sequences in our DNA. It is crucial for understanding human biology, evolution, and the basis of genetic diseases, and it provides insights into the number of genes present in our chromosomes.
Recommended video:
Guided course
05:30Genomes and Genome Evolution
Related Practice
Textbook Question
Sperm and eggs in humans always .
a. each have two copies of every gene;
b. each have one copy of every gene;
c. each contain either all recessive alleles or all dominant alleles;
d. are genetically identical to all other sperm or eggs produced by that person;
e. each contain all of the genetic information from their producer
905
views
Textbook Question
What is the physical basis for the independent assortment of alleles into offspring?
a. There are chromosome divisions during gamete production;
b. Homologous chromosome pairs are separated during gamete production;
c. Sperm and eggs are produced by different sexes;
d. Each gene codes for more than one protein;
e. The instruction manual for producing a human is incomplete.
950
views
Textbook Question
Homologous pairs of chromosomes .
a. are two different chromosomes attached to each other;
b. are exact copies of one chromosome that are attached to each other;
c. are separated from each other during meiosis I;
d. are separated from each other during interphase;
e. are chromosomes that carry different genes
2051
views
Textbook Question
After telophase I of meiosis, each daughter cell is .
a. diploid, and the chromosomes are composed of one double-stranded DNA molecule;
b. diploid, and the chromosomes are composed of two sister chromatids;
c. haploid, and the chromosomes are composed of one double-stranded DNA molecule;
d. haploid, and the chromosomes are composed of two sister chromatids
1979
views