The fertilized egg cell of a mouse contains 40 chromosomes
Chromosomes makes up genes while genes and chromosomes make up the entirety of DNA. A living organism inherits 46 chromosomes, 23 from each parent. These chromosomes are not genes but they form genes, which are just the traits of an individual that are unique. DNA is the entire make up of an organism that controls everything about a person such as likelihood to have disease or their physical appearance.
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a. that are all affected
Since the father is homozygous dominant (AA), and he is affected, that means that the disorder (or whatever it is), is autosomal dominant (plus it directly tells you that). That means it is not carried on the sex chromosomes. Since every child he has will inherit one of his alleles, they will all be affected by having at least the one.
A compound is two or more different substances.
