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17 Aug 2019

1. Three common alleles of the B (black) gene control coat color in most mammals: BB = black coat bb = dark brown coat bl bl = light brown coat They have the following dominance relationship: B > b > bl This notation means that B is dominant to both other alleles, and b is dominant to bl. How many genotypes are possible for black cats?

2. This is Part A of a two-part question. In Part A you'll choose the word to remove from this sentence, in Part B you'll choose the word to replace it with. Consider the following incorrect statement: In a heterozygote for a dominant/recessive allele pair we see the phenotype associated with both of the alleles. Part A Which underlined word makes the sentence incorrect? Part B Which word should replace the word you removed in Part A, to make the statement correct? In a heterozygote for a dominant/recessive allele pair we see the phenotype associated with both of the alleles.

3. Why do red blood cells heterozygous for the ABOA and ABOB alleles react to both Type A and Type B antisera?

4. Consider a mutation in a membrane-transport protein like CFTR. Which kind(s) of amino acid change in a trans-membrane segment would you expect to decrease the ability of the segment to stay in the membran A) Replacing a hydrophobic amino acid with a hydrophilic one B) Deleting a string of 3 hydrophobic amino acids C) Inserting a single hydrophilic amino acid D) Replacing a hydrophilic amino acid with a hydrophobic one E) None of the above choices are correct.

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Casey Durgan
Casey DurganLv2
18 Aug 2019

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