The cells of the human body all contain 46 chromosomes each. How many of those chromosomes came from the father?
If each cell in human beings contain 46 chromosomes, how many came from the mother?
Is 46 the haploid or diploid number of chromosomes for humans?
The two chromosomes that make up a pair are called ____ chromosomes.
Each chromosome in a homologous pair contains genes for the same ____.
A trait is a genetic characteristic of an individual. Check each box below that represents a trait for a human.
Look at the Problem-Solving Lab on page 264. Alleles are paired genes on homologous chromosomes. They are for the same trait, but they might represent that trait differently. For example, there is a gene for eye color on each gene in a homologous pair, but one might be for blue eyes and one for brown eyes. In a diagram, the blue eyed gene might be represented by a lower-case letter and brown eyes might be shown with a capital letter, but it would be the same letter.Look at Chromosome #1. The letters represent genes. Which of the other chromosomes might be homologous with chromosome 1?
Humans have 46 chromosomes in each cell. When gametes are formed how many chromosomes does each gamete have?
A dog has 78 chromosomes but a chimp has 48. That means a dog is genetically more complex than a chimp.
When homologous pairs of chromosomes pair up during meiosis (Prophase I), sometimes genetic material is exchanged between them. This process is called ____ ____.
Mitosis produces identical copies of chromosomes in a cell, but meiosis is different. Crossing over and the independent segregation of chromosomes during meiosis can be a source of ____ among organisms.
A mistake during meiosis called nondisjunction sometimes causes a gamete to have an extra chromosome or to be missing a chromosome. In humans, a disorder called Down's syndrome results from an extra chromosome in the 21st pair. Humans with Down's syndrome have how many chromosomes in their cells?
Organisms that has more than the normal number of chromosome sets are called ____.
In plants, polyploidy is common and results in healthier individuals. In animals, however, polyploidy is rare, and it almost always results in the death of the ____.
When genes are inherited together because they occur close together on the chromosome, they are said to be ____.