Sheep have 54 chromosomes, while goats have 60 chromosomes. The hybrid offspring of a sheep-goat pairing is called a geep. During fertilisation, an egg from the sheep is fertilised by a sperm from the goat, resulting in a geep. Which of the following will be correct for the geep? A. n = 29 chromosomes. B. n = 52 chromosomes. C. 2n = 57 chromosomes. D. 2n = 114 chromosomes.

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Sheep have 54 chromosomes, while goats have 60 chromosomes - HSC - SSCE Biology - Question 9 - 2023 - Paper 1

Question 9

Sheep have 54 chromosomes, while goats have 60 chromosomes. The hybrid offspring of a sheep-goat pairing is called a geep. During fertilisation, an egg from the she... show full transcript

Worked Solution & Example Answer:Sheep have 54 chromosomes, while goats have 60 chromosomes - HSC - SSCE Biology - Question 9 - 2023 - Paper 1

Step 1

Determine the total number of chromosomes in the geep

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Answer

To determine the total number of chromosomes in the geep, we need to consider the number of chromosomes contributed by each parent. The sheep contributes 27 chromosomes (half of 54), and the goat contributes 30 chromosomes (half of 60). Therefore, the haploid number (n) for the geep is:

$n = 27 + 30 = 57$

This means that the diploid number (2n), which is the total number of chromosomes, would be:

$2n = 2 imes 57 = 114$

Step 2

Select the correct option for the geep's chromosome number

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Answer

Based on our calculations, the correct option is:

D. 2n = 114 chromosomes.

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