humans vs. cats comparison chart
figure 1 above is an image of the human genome. the human genome is a name for all the dna found inside a single cell. the picture shows us that humans have 23 pairs of chromosomes (so 46 in total). humans are 99.9% the same as the person sitting next to us. the 0.1% difference tells us everything from our eye color to whether were predisposed to certain diseases.
figure 2 above is an image of a cats genome. cats are more like us than youd think. a 2007 study found that about 90% of the genes in the abyssinian domestic cat are exactly the same as in humans. think of it like this: if you wrote the code for human dna in 100 page book, only 10 of those pages would be different from a cats dna book.
according to the reading above, human and cat dna are extremely similar. use the information above to describe how human and cat dna are different.
key concept 4:
dna is a long that contains the code for how living organisms grow, and function.
key concept 5:
the dna molecule - up into pairs of x - shaped structures called.

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### Part 1: Describing how human and cat DNA are different
# Brief Explanations:
1. **Genetic Similarity Percentage**: From the text, humans are 99.9% similar to each other, while the Abyssinian domestic cat shares about 90% of its genes with humans. So the difference in genetic similarity is $99.9\% - 90\%= 9.9\%$ (or in the "book" analogy, if human DNA is a 100 - page book, 10 pages differ for cats, while for humans only 0.1 pages (since $0.1\%$ of 100 is 0.1) differ from another human).
2. **Chromosome Count (from the figures)**: Figure 1 (human) shows 23 pairs of chromosomes (46 total), while Figure 2 (cat) - by counting the pairs: let's count the rows. First row: 5 pairs, second row: 5 pairs, third row: 3 pairs, fourth row: 4 pairs? Wait, no, looking at the cat's karyotype (Figure 2), let's count the pairs. Let's list them:
   - Row 1: 5 pairs (1 - 5)
   - Row 2: 5 pairs (6 - 10)
   - Row 3: 3 pairs (11 - 13? Wait, no, the third row has 11,12,13,14,15? Wait, no, the cat's karyotype: let's count the number of chromosome pairs. Let's see, the human has 23 pairs. The cat's karyotype: let's count the X - shaped structures (chromosomes) in pairs. Let's count:
     - First row: 5 pairs (1 - 5)
     - Second row: 5 pairs (6 - 10)
     - Third row: 3 pairs? No, 11,12,13,14,15? Wait, no, the third row: 11,12,13,14,15? Wait, the third row has 11,12, then 13,14,15 (three pairs? No, 11 and 12 are pairs, 13,14,15: 13 is a pair, 14 is a pair, 15 is a pair? Wait, no, the third row: 11 (pair), 12 (pair), 13 (pair), 14 (pair), 15 (pair)? Wait, no, the image shows for the cat:
       - Row 1: 5 pairs (1 - 5)
       - Row 2: 5 pairs (6 - 10)
       - Row 3: 3 pairs? No, 11,12,13,14,15: 11 (pair), 12 (pair), 13 (pair), 14 (pair), 15 (pair) – that's 5? Wait, no, the third row: 11,12, then 13,14,15 (three pairs? No, the third row has 11,12,13,14,15: 11 and 12 are pairs, 13,14,15: 13 is a pair, 14 is a pair, 15 is a pair? Wait, maybe I'm miscounting. Alternatively, from the text, the human has 23 pairs, and the cat's chromosome number: cats have 19 pairs of autosomes and 1 pair of sex chromosomes, so total 20 pairs? Wait, no, the standard cat karyotype has 19 pairs of autosomes and 1 pair of sex chromosomes, so 20 pairs total (38 chromosomes). The human has 23 pairs (46 chromosomes). So the number of chromosome pairs is different: human has 23 pairs, cat has 19 + 1=20 pairs? Wait, the sex chromosomes: human has X and Y (in males) or XX (in females). The cat also has X and Y (in males) or XX (in females). But the total number of chromosome pairs: human 23, cat 19 (autosomes) + 1 (sex)=20 pairs. So the chromosome count (number of pairs) is different: human has 23 pairs, cat has 20 pairs (38 chromosomes vs 46 in humans).
   - So, in summary, the differences are:
     - **Genetic Similarity**: Humans are 99.9% similar to each other, while cats share about 90% of their genes with humans (so a 9.9% difference in genetic similarity between humans and cats, compared to the 0.1% difference between humans).
     - **Chromosome Number**: Humans have 23 pairs of chromosomes (46 total), while cats have 19 pairs of autosomes and 1 pair of sex chromosomes, totaling 20 pairs (38 total chromosomes). Also, the structure of individual chromosomes (as seen in the karyotypes) may differ in appearance (e.g., size, banding patterns, etc., though the text doesn't elaborate on that, but the figures show different arrangements).

# Answer:
- **Genetic Similarity**: Humans are 99.9% genetically similar to one another, while the Abyssinian domestic cat shares only about 90% of its genes with humans. This means there is a $9.9\%$ greater genetic difference between humans and cats than between two humans. Using the "DNA book" analogy, if human DNA were written in a 100 - page book, only 0.1 pages (representing the $0.1\%$ difference) would differ between two humans, but 10 pages (representing the $10\%$ difference) would differ between a human and a cat.
- **Chromosome Number**: Humans have 23 pairs of chromosomes (46 total), while cats have 20 pairs of chromosomes (38 total, with 19 pairs of autosomes and 1 pair of sex chromosomes). The karyotypes (chromosome arrangements) also visually differ, with humans having 23 pairs (as seen in Figure 1) and cats having a different number of pairs (as seen in Figure 2).

### Part 2: Key Concept 4
# Brief Explanations:
DNA is a long **molecule** (specifically a double - helix - shaped molecule made of nucleotides) that contains the code for how living organisms grow, **develop**, and function. The central dogma of molecular biology and basic genetics tell us that DNA carries the genetic information that dictates an organism's growth (like cell division and body plan development), development (from embryo to adult), and cellular/biological function (e.g., protein synthesis for enzyme production, structural components, etc.).

# Answer:
DNA is a long $\boldsymbol{\text{molecule}}$ that contains the code for how living organisms grow, $\boldsymbol{\text{develop}}$ and function.

### Part 3: Key Concept 5
# Brief Explanations:
The DNA molecule **packages** (or "condenses") up into **pairs** of X - shaped structures called **chromosomes** during cell division (specifically during mitosis or meiosis when the cell is preparing to divide). In a normal cell (interphase), DNA is in a less - condensed form (chromatin), but when the cell divides, it condenses into visible chromosomes. Humans have 23 pairs of chromosomes, as seen in the human karyotype (Figure 1). The process of DNA condensing into chromosomes involves wrapping around histone proteins and further coiling.

# Answer:
The DNA molecule $\boldsymbol{\text{packages}}$ - up into $\boldsymbol{23}$ pairs of X - shaped structures called $\boldsymbol{\text{chromosomes}}$ (Note: For cats, it would be 20 pairs, but the key concept is likely general, and in humans, we have 23 pairs. However, if we consider the general process, the first blank is "packages" (or "condenses"), the second blank (number of pairs) – in humans, it's 23, but the question might be general. Wait, the question says "The DNA molecule ____ - up into ____ pairs of X - shaped structures called ____." Let's re - examine. The DNA molecule **condenses** (or "packages") into **chromosome** pairs. In humans, it's 23 pairs, but the question might be general. Let's correct: The DNA molecule **condenses** (or "packages") up into **chromosome** pairs (the number of pairs depends on the species; for humans, 23). So the correct fill - ins: The DNA molecule $\boldsymbol{\text{condenses}}$ - up into $\boldsymbol{23}$ (for humans) pairs of X - shaped structures called $\boldsymbol{\text{chromosomes}}$. But if we consider the general process, the first blank is "condenses" (or "packages"), the second blank (number of pairs) – in the context of the previous human - cat comparison, but the key concept is about DNA packaging into chromosomes. So the answer is:

The DNA molecule $\boldsymbol{\text{condenses}}$ - up into $\boldsymbol{23}$ pairs of X - shaped structures called $\boldsymbol{\text{chromosomes}}$ (for humans; for cats, it's 20 pairs, but the key concept likely refers to the general process of DNA condensing into chromosomes, with the number of pairs specific to the species. In the context of the human - cat comparison, and the human karyotype shown, the number of pairs for humans is 23).

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Explanation:

Part 1: Describing how human and cat DNA are different

Answer:

Part 2: Key Concept 4