Chromosomes and Karyotyping

Front

What are chromosomes?

Back

Chromosomes are long, thread-like structures made of DNA and proteins that contain genetic information. They are found in the nucleus of eukaryotic cells.

Front

What is a karyotype?

Back

A karyotype is a visual representation of an individual's chromosomes, arranged in pairs and organized by size and shape, used to identify chromosomal abnormalities.

Front

What is the diploid number of chromosomes?

Back

The diploid number (2n) is the total number of chromosomes in a somatic cell, which includes two sets of chromosomes, one from each parent.

Front

What is the haploid number of chromosomes?

Back

The haploid number (n) is the number of chromosomes in a gamete (sperm or egg cell), which is half the diploid number.

Front

If squirrels have 40 chromosomes in their diploid cells, how many chromosomes are in their egg cells?

Back

20

Front

What are homologous chromosomes?

Back

Homologous chromosomes are pairs of chromosomes, one inherited from each parent, that have the same genes at the same loci but may have different alleles.

Front

What is crossing over?

Back

Crossing over is the process during meiosis where homologous chromosomes exchange genetic material, leading to genetic variation in offspring.

Front

What is genetic variation?

Back

Genetic variation refers to the diversity in gene frequencies within a population, which is essential for evolution and adaptation.

Front

What is the significance of the centromere?

Back

The centromere is the region of a chromosome where the two sister chromatids are joined together and is crucial during cell division.

Front

What is the difference between autosomes and sex chromosomes?

Back

Autosomes are non-sex chromosomes that determine most of an organism's traits, while sex chromosomes determine the sex of the individual.