Lesson 544 of 1524
Reproduction at the Cellular Level
An organism’s traits are determined in large part by the genes inherited from each parent, but also by the environment that they experience.
Practice this chapterAn organism’s traits are determined in large part by the genes inherited from each parent, but also by the environment that they experience. Human somatic cells have 46 chromosomes consisting of two sets of 22 homologous chromosomes and a pair of nonhomologous sex chromosomes.
Human gametes have 23 chromosomes or one complete set of chromosomes. Genes are segments of DNA that code for a specific protein or RNA molecule.
homologous chromosomes — chromosomes of the same length with genes in the same location; diploid organisms have pairs of homologous chromosomes, and the members of each pair come from different parents. organism’s traits — determined in large part by the genes inherited from each parent, but also by the environment that they experience. gene — the physical and functional unit of heredity; a sequence of DNA that codes for a specific peptide or RNA molecule. cell cycle — the ordered sequence of events that a cell passes through between one cell division and the next.
Worked example
What does “homologous chromosomes” mean in Reproduction at the Cellular Level?
- 1Use the wording this chapter gives for homologous chromosomes.
- 2The book says: chromosomes of the same length with genes in the same location; diploid organisms have pairs of homologous chromosomes, and the members of each pair come from different parents.
- 3Do not use the meaning of organism’s traits. That term means determined in large part by the genes inherited from each parent, but also by the environment that they experience.
Result: chromosomes of the same length with genes in the same location; diploid organisms have pairs of homologous chromosomes, and the members of each pair come from different parents
Why. That is the meaning this chapter gives for homologous chromosomes.
Do not swap homologous chromosomes and organism’s traits. homologous chromosomes means chromosomes of the same length with genes in the same location; diploid organisms have pairs of homologous chromosomes, and the members of each pair come from different parents. organism’s traits means determined in large part by the genes inherited from each parent, but also by the environment that they experience.
Practice margin
This chapter
A fresh set from this chapter only. Choose 10 or 20. Multiple choice and fill-in, with no repeat inside the set.