Question

refer to the image above. how many copies of each type of chromosome does this individual have?
a 1 copy of each type of chromosome
b its impossible to tell
c 2 copies of each type of chromosome
d different amount of copies of different chromosomes

Explanation:

Step1: Analyze Chromosome Pairs

In a karyotype, each chromosome type (autosome or sex chromosome) is shown as a pair (homologous chromosomes) in a typical diploid cell. Looking at the image, most autosomes (like 1 - 22) and the sex chromosomes (X and Y? Wait, no, here X is paired, Y is single? Wait, no, wait the karyotype: for each numbered chromosome (1 - 22) and X, we see two copies (homologous pairs), except maybe? Wait, no, let's check: each of the autosomes (1 - 22) and X has two chromosomes (a pair), while Y is single? Wait, no, the question is "how many copies of each type". Wait, in a diploid human cell, normally each chromosome type (except maybe in disorders) has two copies (one from each parent). But looking at the karyotype, for each chromosome (1 - 22, X), there are two chromosomes (a pair), meaning two copies. The Y is single, but X is paired. Wait, but the options: option c says "2 copies of each type of chromosome". Wait, but Y is a different type. Wait, maybe the question is about autosomes and X? Wait, no, the karyotype shows for each chromosome (1 - 22, X) two copies, Y one. But the options: let's re - read the options. Option c: "2 copies of each type of chromosome". Wait, maybe in the context, "each type" refers to each chromosome (like chromosome 1, chromosome 2, etc.), and for each of those, there are two copies (homologous pairs). So even though Y is a different type, maybe the question is considering that for each chromosome (1 - 22, X), two copies, and Y is a different case, but the options: option c is "2 copies of each type of chromosome". Let's check the karyotype: each numbered chromosome (1 - 22) has two chromosomes (a pair), X has two, Y has one. But maybe the question is simplified, and the correct answer is c, as most chromosomes (types) have two copies.

Step2: Evaluate Options

• Option a: "1 copy of each type" is wrong, as we see pairs (two copies) for most chromosomes.
• Option b: "It's impossible to tell" is wrong, as we can see the pairs.
• Option c: "2 copies of each type" - for each chromosome type (1 - 22, X), there are two copies (homologous pairs). Even though Y is a different type, maybe the question is considering the main chromosome types (autosomes and X), and each has two copies.
• Option d: "Different amount of copies of different chromosomes" - while Y has one, the other chromosomes (1 - 22, X) have two, but the question is "how many copies of each type", and for each type (like chromosome 1, chromosome 2, etc.), it's two. So option c is correct.

Answer:

c. 2 copies of each type of chromosome