Question

45 the diagram shows the karyotype of a muscle cell from a wild sheep. sheep karyotype 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 homologous pair 25 26 xy select the two correct statements based on the information contained in this karyotype. a the sheep has 54 total chromosomes

Explanation:

Step1: Count total chromosomes

To find the total number of chromosomes, we count each chromosome in the karyotype. Let's count the pairs and the sex chromosomes:
- Pairs 1 - 26: Each pair has 2 chromosomes, so \(26\times2 = 52\) chromosomes from pairs.
- Sex chromosomes (XY): 2 chromosomes (X and Y).
- Wait, wait, let's re - count the karyotype. Let's count the rows:
- First three rows (1 - 24): Each row has 8 pairs? Wait, no, let's count the number of chromosomes:
- Rows 1 - 3: Each has 8 pairs (1 - 8, 9 - 16, 17 - 24), so \(3\times8\times2=48\)? Wait, no, looking at the diagram:
- Row 1: 8 chromosomes (1 - 8, 2 each)
- Row 2: 8 chromosomes (9 - 16, 2 each)
- Row 3: 8 chromosomes (17 - 24, 2 each)
- Row 4: 3 chromosomes (25, 26, XY)
- Wait, no, let's count the number of chromosomes:
- Chromosomes 1 - 26 (pairs) and XY. Wait, the pairs are 1 - 26? Wait, no, the first three rows: 1 - 8, 9 - 16, 17 - 24 (that's 24 chromosomes, 12 pairs), then row 4: 25, 26, XY. Wait, no, let's count the number of chromosomes:
- Let's count the number of chromosomes:
- The first three rows (1 - 24): each of these is a pair, so 24 pairs? No, no, the first row: 1 - 8 (8 pairs, 16 chromosomes), second row: 9 - 16 (8 pairs, 16 chromosomes), third row: 17 - 24 (8 pairs, 16 chromosomes), fourth row: 25, 26, XY (3 chromosomes? Wait, no, 25 is a pair? Wait, no, the diagram shows 25 as a pair? Wait, no, the fourth row: 25 (a pair? No, the image shows 25 as two chromosomes? Wait, no, the user's diagram:
- Row 1: 1 (pair), 2 (pair), 3 (pair), 4 (pair), 5 (pair), 6 (pair), 7 (pair), 8 (pair) → 8 pairs (16 chromosomes)
- Row 2: 9 (pair), 10 (pair), 11 (pair), 12 (pair), 13 (pair), 14 (pair), 15 (pair), 16 (pair) → 8 pairs (16 chromosomes)
- Row 3: 17 (pair), 18 (pair), 19 (pair), 20 (pair), 21 (pair), 22 (pair), 23 (pair), 24 (pair) → 8 pairs (16 chromosomes)
- Row 4: 25 (pair), 26 (pair), XY (2 chromosomes) → Wait, no, 25 and 26 are pairs? Wait, the diagram shows 25 as a pair? No, the fourth row: 25 (two chromosomes), 26 (two chromosomes), XY (two chromosomes). Wait, that can't be. Wait, maybe I made a mistake. Let's count the total number of chromosomes:
- Let's count the number of chromosomes:
- The first three rows: each has 8 pairs (1 - 8, 9 - 16, 17 - 24), so \(3\times8\times2 = 48\) chromosomes.
- The fourth row: 25 (2), 26 (2), XY (2) → 6 chromosomes? No, that can't be. Wait, the problem says "karyotype of a muscle cell". Muscle cells are diploid. Let's check the sex chromosomes: XY means male. Now, let's count the total number of chromosomes:
- Let's count the number of chromosomes:
- Pairs 1 - 26: Wait, no, the pairs are 1 - 26? Wait, the first three rows: 1 - 8, 9 - 16, 17 - 24 (24 chromosomes, 12 pairs), then 25, 26, XY. Wait, 25 and 26 are pairs? So 12 + 2=14 pairs (28 chromosomes) plus XY? No, this is confusing. Wait, the option A says 54 total chromosomes. Let's calculate: if we have 27 pairs (since 27×2 = 54). Let's count the number of pairs:
- Rows 1 - 3: 8 pairs each (1 - 8, 9 - 16, 17 - 24) → 24 pairs (48 chromosomes)
- Row 4: 25, 26, XY. Wait, 25 and 26 are pairs? So 2 more pairs (4 chromosomes) and XY (2 chromosomes). Wait, no, maybe the first three rows have 12 pairs (24 chromosomes), row 4 has 3 chromosomes (25, 26, XY). No, this is not working. Wait, let's think about sheep karyotype: Domestic sheep have 54 chromosomes (27 pairs). So if the wild sheep has a karyotype with 27 pairs (including XY), then total chromosomes are 54. So option A: "The sheep has 54 total chromosomes" is correct.

Step2: Determine the sex

The sex chromosomes are XY, which is the male sex chromosome combination in mammals. So the sheep is a male. So the correct options are A and the option about the sheep being male (let's assume the second option is "The sheep is a male").

Answer:

A. The sheep has 54 total chromosomes; B. The sheep is a male (assuming the second option is "The sheep is a male")