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Exploring Creation with Biology 2nd Edition Module 8 Test

Terms in this set (12)

A. True Breeding
B. Allele
C. Recessive Allele
D. Monohybrid Cross
E. Dihybrid Cross
F. Autosomal Inheritance
A. If an organism has a certain characteristic that is always passed on to its offspring, we say that this organism bred true with respect to that characteristic.
B. One of a pair of genes that occupies the same position on homologous chromosomes.
C. An Allele that will not determine the phenotype unless the genotype is homozygous in that allele.
D. A cross between two individuals, concentrating on only one definable trait.
E. A cross between two individuals, concentrating on two definable traits.
F. Inheritance of a genetic trait not on a sex chromosome.
State the principles of Mendelian genetics using the updated terminology.
A. The traits of an organism are determined by packets of information called factors.
B. Each organism has not one but two allele that determines its traits.
C. In sexual reproduction, each parent contributes only one of its factors to the offspring.
D. In each definable trait, there is a dominant allele. If it exits in a organism the trait determined by the dominant allele will be exposed.
3. In humans, the ability to roll one's tongue is a dominant genetic trait. If R represent this allele and "r" represents the recessive allele, what are the possible genotypes for a person who can roll his tongue.
Rr and RR.
For a given trait, how many alleles does a normal gamate have.
1 allele.
For a given trait how many alleles does a non-gamate cell have.
2 allele.
A. The ability for a person to taste PTC is a dominant genetic trait "T", while the inability to taste PTC is recessive " t". If a man is heterozygous in that trait, what is a genotype.
B. If a woman cannot taste PTC, what is her genotype.
C. Determine the percentage chance of each genotype for the children of the man in "a" and the woman in "b".
A. Tt
B. tt
C. Punnet Square with Tt and tt. The percentage is 50% for Tt and 50% for tt.
7. Hemophilia is a sex linked, recessive trait.
A. Write the punnet square for a non- hemophiliac man having children with a woman who carries but does not have the disease.
B. What percentage of the girls will have the disease?
C. What percentage of the boys will have the disease?
A Punnet square with XHXH, XHY, XHXh, and XhY
B. 0%
C. 50%
8. Why do recessive phenotypes in sex-linked traits show up in males significantly more often than in females.
There is no y chromosome.
Why would you not expect twins who identical DNA to be identical in every way.
Only one genetic will play in their makeup.
Name four means by which genetic disorders arise.
Autosomal inheritance, sex linked inheritance, allele mutation, and changes in the chromosomes structure.
11. A pea plant is heterozygous in both the color of the pea produced ("Y" for yellow and "y" for green) and the height of the plant ("T" for tail and "t" for short).
A. What possible combination of allele exist in gamates?
B. Draw the resulting punnet square for when this plant is self pollinated.
C. What are the possible phenotypes and their percent chance.
A. Yt, YT, yt, and yT.
B. Punnet square with YYTT, YYTt, YyTT, YyTt, YYTt, YYtt, YyTt, Yytt, YyTT, YyTt, yyTT, yyTt, YyTt, Yytt, YyTt, yytt.
C. 9/16 or 56.25 Tall yellow peas, 3/16 or 18.75 Tall green peas, 3/16 or 18.75 for short yellow peas, and 1/16 or 6.25 for short green.
12. The following pedigree is for humans, concentrating on the ability to roll their tongues. Since you already know that the ability to roll your tongue is dominant and the inability to do so is recessive, determine whether the filled circles and squares represent those who can or those who cannot roll their tongues.
The empty represent dominant and filled represent recessive.
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