Several crosses were carried out between pairs of cats as follows - VCE - SSCE Biology - Question 1 - 2004 - Paper 1
Question 1
Several crosses were carried out between pairs of cats as follows.
mackerel tabby
female
X
blotched tabby
male
All of the mackerel tabby cats were heterozygous.
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Worked Solution & Example Answer:Several crosses were carried out between pairs of cats as follows - VCE - SSCE Biology - Question 1 - 2004 - Paper 1
Step 1
approximately 50 mackerel tabby females.
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Answer
The mackerel tabby female is heterozygous, meaning it can produce both mackerel and blotched tabby offspring. Given the heterozygous nature of the mackerel tabby female, it can be expected that approximately half of the offspring will display mackerel tabby characteristics, leading us to predict around 50 mackerel tabby females.
Step 2
approximately 25 blotched tabby females.
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Answer
Using the same logic, the mackerel tabby female will produce a smaller proportion of blotched tabby offspring. With a suitable Mendelian ratio and from a total of 100 kittens, it would be suitable to estimate around 25 of these kittens will be blotched tabby females.
Step 3
more mackerel tabby females than mackerel tabby males.
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Answer
Due to the ratio of males produced generally from the crosses, it is reasonable to expect that the total count of mackerel tabby females will exceed that of the males, adhering to common biological patterns.
Step 4
more blotched tabby males than blotched tabby females.
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Answer
Similarly, the expectation based on typical breeding patterns and the male contribution would suggest that the number of blotched tabby males could certainly outnumber their female counterparts in this scenario.
