Genotype. A genotype is
an individual's collection of genes
. The term also can refer to the two alleles inherited for a particular gene. The genotype is expressed when the information encoded in the genes' DNA is used to make protein and RNA molecules.
How do you determine genotypes?
genotype =
the genes of an organism
; for one specific trait we use two letters to represent the genotype. A capital letter represents the dominant form of a gene (allele), and a lowercase letter is the abbreviation for the recessive form of the gene (allele).
Can you be sure of the genotypes of the affected siblings of individual
Can you be sure of the genotypes of the affected siblings of individual #3? Explain.
No
, as long as have one copy of the dominant allele, they will have the trait.
What are the 3 possible genotypes that a person can inherit?
Genotype is also used to refer to the pair of alleles present at a single locus. With alleles ‘A' and ‘a' there are three possible genotypes
AA, Aa and aa
. With three alleles 1, 2, 3 there are six possible genotypes: 11, 12, 13, 22, 23, 33. First we must appreciate that genes do not act in isolation.
Can you use a pedigree to determine genotypes of individuals?
Reading a pedigree
By
analyzing a pedigree
, we can determine genotypes, identify phenotypes, and predict how a trait will be passed on in the future. The information from a pedigree makes it possible to determine how certain alleles are inherited: whether they are dominant, recessive, autosomal, or sex-linked.
Can ones genotype change?
Genotype generally remains constant from one environment to another
, although occasional spontaneous mutations may occur which cause it to change. However, when the same genotype is subjected to different environments, it can produce a wide range of phenotypes.
Can AA and SS marry?
AC is rare whereas AS and AC are abnormal. Compatible genotypes for marriage are: AA marries an AA. … And definitely,
SS and SS must not marry since
there's absolutely no chance of escaping having a child with the sickle cell disease.
What is the genotype for gray fur?
ff: 257. Black fur: 257. Grey fur:
757
. Genotypes: EE: 1007.
Which allele is always written first?
When expressing dominant and recessive alleles,
the dominant allele
is always written as a capitalized letter, and the recessive allele as the same letter, but lower case.
What is a purebred genotype?
Purebred – Also called HOMOZYGOUS and
consists of gene pairs with genes that are the SAME
. … Genotype is the actual GENE makeup represented by LETTERS. Phenotype is the PHYSICAL appearance of a trait, such as a YELLOW (or BLUE) body color.
What traits are inherited?
- Eye Colour. Dominant and recessive genes play a role in determining eye colour of the child. …
- Height. If the father is tall, there is more chance for the child to also be tall. …
- Dimples. …
- Fingerprints. …
- Lips. …
- Sneezing. …
- Teeth structure. …
- Mental disorders.
What is AA in genotype?
A
homozygous dominant
(AA) individual has a normal phenotype and no risk of abnormal offspring. A homozygous recessive individual has an abnormal phenotype and is guaranteed to pass the abnormal gene onto offspring.
What is the blood group of AA genotype?
| Mother's Blood Type Possible Mother's Genotype Possible Father's Genotype | A AA, AO AA, AO | A AA, AO AB | A AA, AO BB, BO | A AA, AO OO |
|---|
How many dominant alleles does an individual need?
When a trait is dominant, only
one allele
is required for the trait to be observed. A dominant allele will mask a recessive allele, if present. A dominant allele is denoted by a capital letter (A versus a).
How do you explain a pedigree chart?
A pedigree chart displays a family tree, and
shows the members of the family who are affected by a genetic trait
. This chart shows four generations of a family with four individuals who are affected by a form of colorblindness. Circles represent females and squares represent males.
What does a shaded circle mean in a pedigree?
A circle represents a female. A square represents a male. … A completely shaded circle or square indicates
that a person expresses the trait
. A circle or square that is not shaded indicates that a person neither expresses the trait nor is a carrier of the trait.
