Question

meiosis: chromosome number
determine the diploid and haploid numbers of chromosomes for each species:

species

diploid number (2n)

haploid number (n)

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----

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domestic cat - felis catus

38

?

nile crocodile - crocodylus niloticus

?

16

cabbage - brassica oleracea

?

9

yellow fever mosquito - aedes aegypti

6

?

donkey - equus africanus asinus

62

?

polar bear - ursus maritimus

?

37

did you know?cabbage, broccoli, kale, cauliflower & brussels sprouts are all the same species! they were selectively bred for their specific characteristics.as they are the same species, they all have the same chromosome number!tip:\hap\ sounds a little bit like \half\, so haploid cells contain half the number of chromosomes as a diploid cell

Explanation:

Step1: Recall ploidy relationship

The key relationship is: $n = \frac{2n}{2}$ and $2n = 2 \times n$, where $2n$ = diploid number, $n$ = haploid number.

Step2: Solve for Domestic cat haploid

Divide diploid by 2.
$n = \frac{38}{2} = 19$

Step3: Solve for Nile crocodile diploid

Multiply haploid by 2.
$2n = 2 \times 16 = 32$

Step4: Solve for Cabbage diploid

Multiply haploid by 2.
$2n = 2 \times 9 = 18$

Step5: Solve for Yellow fever mosquito haploid

Divide diploid by 2.
$n = \frac{6}{2} = 3$

Step6: Solve for Donkey haploid

Divide diploid by 2.
$n = \frac{62}{2} = 31$

Step7: Solve for Polar bear diploid

Multiply haploid by 2.
$2n = 2 \times 37 = 74$

Answer:

Species	Diploid number (2n)	Haploid number (n)
Nile crocodile - Crocodylus niloticus	32	16
Cabbage - Brassica oleracea	18	9
Yellow fever mosquito - Aedes aegypti	6	3
Donkey - Equus africanus asinus	62	31
Polar bear - Ursus maritimus	74	37