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Biology 1 exam 3 study

Terms in this set (47)

What effect do multiple crossovers between two genes have on the estimated genetic distance between them?
Lead to an underestimate of the true distance
Huntington disease is an autosomal dominant condition. If an affected heterozygous female and unaffected male have 4 childrenhow many of the children would we expect to be affected?
2
Which of the following observations from a pedigree suggest a trait is X-linked recessive ?
Males are more likely to have the trait
In pea plants, green pods are dominant to yellow pods. Which of the following is an example a test cross for the pod color trait?
Plant with green pods crossed with plant with yellow pods.
In a study of fruit flies mapping the location of two genes, 50 out of 500 total progeny from a test cross of a double heterozygote were found to be recombinant. What is the distance between the two genes in centimorgans ?
10 cM
Which of the following questions cannot be answered by pedigree analysis ?
None of the above
Which of the following is NOT considered to be an exception to chromosomal inheritance?
Polygenic inheritance
Why is genetic mapping more difficult in humans than in fruit flies?
Controlled crosses cannot be performed in humans
Which mRNA sequence would be produced from the following DNA template strand: 3- GCATTATCCCTG-5?
5'-CGUAAUAGGGAC-3'
How many possible codons are there in the genetic code?
64
How many amino acids would be encoded by the sequence 5 AUGCGAGUAUACUGA-3where AUG is the start codon and UGA the stop codon?
4
You have discovered an alien species whose DNA contains 6 possible nucleotides rather than 4. Interestingly, this species uses codons of length 2 rather than 3 nucleotides. If the genetic code of this species contains only 2 stop codons, what is the maximum number of amino acids that can be encoded?
34
Normal expression of a eukaryotic gene with two exons and one intron leads to a protein of length 100 amino acids. If this same gone were instead expressed in a prokaryote , how long would the resulting protein ?
Cannot be determined
What does it mean that the genetic code is degenerate?
some amino acids are specified by more than one codon
A human protein sequence is made up of 18 of the 20 naturally occurring amino acids. Given that there are three codons in the genetic code, what is the minimum number of unique tRNAs needed to translate this protein?
18
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