If an organism has a certain characteristic that is always passed on to its offspring, we say that this organism bred true with repect to that characteristic

One of a pair of genes that occupies the same position on homologous chromosones

An allele that will not determine the phenotype unless the genotype is homozygous in that allele

A cross between two individuals, concentrating on only one definable trait

A cross between two individuals, concentrating on two definable traits

Autosomal inheritance

Inheritance of a genetic trait not on a sex chromosone

State the principles of Mendelian genetics using the updated terminology

The traits of an organism are determined by its genes/Each organism has 2 alleles that make up the genotype for a given trait/In sexual reproduction, each parent gives only 1 of its alleles to its offspring/In each genotype there is a dominant allele.

In humans, the abiility to roll one's tongue is a dominant genetic trait. If "R" represents this allele and "r" represents the recessive allele, what are the possible genotypes for a person who can roll his tongue?

He could have RR or Rr, becauwse he needs only one dominant allele

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 trai, what is his genotype?

He has one of each allele, so it is Tt

If a woman cannot taste PTC, what is her genotype?

tt, because not being able to tast PTC is recessive

Why do recessive phenotypes in sex-linked traits show up in males significantly more often than in females?

Because there is no allele on the Y chromosone in sex-linked traits, so males have only one allele and have a better chance of being recessive.

Why would you not expect twins (who have identical DNA) to be identical in every way?

Genetics isn't the only thing that makes a person who they are.

Name four means by which genetic disorders arise

sex-linked inheritance, allele mutation, change in chromosone number or structure

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Question	Answer
True breeding	If an organism has a certain characteristic that is always passed on to its offspring, we say that this organism bred true with repect to that characteristic
Allele	One of a pair of genes that occupies the same position on homologous chromosones
Recessive allele	An allele that will not determine the phenotype unless the genotype is homozygous in that allele
Monohybrid cross	A cross between two individuals, concentrating on only one definable trait
Dihybrid cross	A cross between two individuals, concentrating on two definable traits
Autosomal inheritance	Inheritance of a genetic trait not on a sex chromosone
State the principles of Mendelian genetics using the updated terminology	The traits of an organism are determined by its genes/Each organism has 2 alleles that make up the genotype for a given trait/In sexual reproduction, each parent gives only 1 of its alleles to its offspring/In each genotype there is a dominant allele.
In humans, the abiility to roll one's tongue is a dominant genetic trait. If "R" represents this allele and "r" represents the recessive allele, what are the possible genotypes for a person who can roll his tongue?	He could have RR or Rr, becauwse he needs only one dominant allele
For a given trait, how many alleles does a normal gamete have?	One
For a given trait, how many alleles does a non-gamete cell have?	Two
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 trai, what is his genotype?	He has one of each allele, so it is Tt
If a woman cannot taste PTC, what is her genotype?	tt, because not being able to tast PTC is recessive
Determine the percentage chance of each genotype for the children of the man and the woman mentioned above
Hemophilia is a sex-linked, recessive trait. Write a Punnett square for a non-hemophilic man having children with a woman who carries but does not have the disease
What percentage of the girls will have the disease? What percentage of the boys will have the disease?
Why do recessive phenotypes in sex-linked traits show up in males significantly more often than in females?	Because there is no allele on the Y chromosone in sex-linked traits, so males have only one allele and have a better chance of being recessive.
Why would you not expect twins (who have identical DNA) to be identical in every way?	Genetics isn't the only thing that makes a person who they are.
Name four means by which genetic disorders arise	sex-linked inheritance, allele mutation, change in chromosone number or structure
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 tall and "t" for short). What possible combinations of alleles exist in its gametes?	YT, yT, Yt, yt
Draw the resulting Punnet square for the question above, for when this plant is self-pollinated What are the possible phenotypes and their percent chances?

Created by: Snyderpartyof7

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