Bay scallops (Argopecten irradians) have three shell colours: orange, yellow and black - VCE - SSCE Biology - Question 2 - 2005 - Paper 1
Question 2
Bay scallops (Argopecten irradians) have three shell colours: orange, yellow and black. It is known that the colour is under the control of one gene locus with three... show full transcript
Worked Solution & Example Answer:Bay scallops (Argopecten irradians) have three shell colours: orange, yellow and black - VCE - SSCE Biology - Question 2 - 2005 - Paper 1
Step 1
What is a gene locus?
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Answer
A gene locus is the position of a gene on a chromosome.
Step 2
If you compared the alleles of this locus at the molecular level, what would be different?
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Answer
At the molecular level, the sequence of bases/nucleotides in the DNA would be different among the alleles.
Step 3
What is the name given to the process which gives rise to new alleles?
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Answer
The process that gives rise to new alleles is called mutation.
Step 4
Using the allele symbols p^y for yellow, p^o for orange and p^b for black, show the genotypes of the parents and offspring in cross 1.
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Answer
Parent's phenotype: yellow X yellow
Parent's genotype(s): p^y p^y X p^y p^y
Offspring phenotype: yellow
Offspring genotype(s): p^y p^y
Step 5
What term is used to describe the genotype of the black parents and offspring in cross 2?
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Answer
The term used to describe the genotype of the black parents and offspring in cross 2 is homozygous, specifically p^b p^b.
