What would be the ratio of the wire-haired dogs in the F1 generation?
Answer: The genotypic ratio of the F1 generation is: 1:1 OR 50% heterozygous wire-haired, 50% homozygous smooth-haired.
Which gene is more dominant in dogs?
There is a dominant black gene and a recessive black gene—though dominant black is by far the most common. There are are also two forms of yellow. Clear yellow/red is recessive and sable (yellow and dark banded hairs) is dominant. Brown is always recessive.
What is the genotype of a smooth-haired dog?
In dogs, wirey-hair is dominant to smooth hair. In a cross of a homozygous wirey-haired dog with a smooth-haired dog… a) What will be the phenotype and their ratios of the F1 generation? The phenotype of the F1 generation will be 100% wirey-haired.
What percentage of dogs in the F2 generation have wire hair?
b. In the F2 generation, we are breeding the heterozygous offspring together (Ww x Ww). This will produce the characteristic 3:1 ratio of dominant:recessive phenotypes. 3/4 of the offspring will be wire-haired (1/4 WW homozygotes and 1/2 Ww heterozygotes) and 1/4 will be smooth-haired (ww).
What happens when alleles have incomplete dominance?
Incomplete dominance occurs in the heterozygote, in which the dominant allele does not dominate the recessive allele entirely; rather, an intermediate trait appears in the offspring. The offspring do not show the parental phenotype. The offspring shows both parental phenotypes.
What represents a homozygous recessive genotype?
When a particular gene has identical alleles (versions) of chromosomes inherited from both parents, the gene is homozygous. A homozygous trait is referred to by two capital letters (XX) for a dominant trait, and two lowercase letters (xx) for a recessive trait.
Are blue eyes homozygous or heterozygous?
Of these three genotypes, only bb, the homozygous recessive genotype, will produce a phenotype of blue eyes. The heterozygous genotype and the homozygous dominant genotype both will produce brown eyes, though only the heterozygous genotype can pass on the gene for blue eyes.
What is an example of a heterozygous trait?
Your genes are made of DNA. If the two versions are different, you have a heterozygous genotype for that gene. For example, being heterozygous for hair color could mean you have one allele for red hair and one allele for brown hair. The relationship between the two alleles affects which traits are expressed.
Is DD a heterozygous or homozygous?
Sally’s genotype is “dd”, so she is also considered homozygous. Susan’s genotype is “Dd”, so she is considered HETEROZYGOUS (has two different alleles for a specific gene)….
| t | t | |
|---|---|---|
| T | Tt (tall) | Tt (tall) |
Are females heterozygous or homozygous?
Females (XX) have two copies of each gene on the X chromosome, so they can be heterozygous or homozygous for a given allele. However, males (XY) will express all the alleles present on the single X chromosome that they receive from their mother, and concepts such as ‘dominant’ or ‘recessive’ are irrelevant.
What are the clinical issues associated with being heterozygous?
in heterozygotes has been reported together with signs of a slightly increased cerebral irritability, a possible slight increase of risk for mental disease, and an increase of blood phenylalanine levels in stress situations.
Is the genotype FF heterozygous or homozygous?
Mendelian Genetics
| Genotype | Phenotype | |
|---|---|---|
| F F | Homozygous dominant | No cystic fibrosis (Normal) |
| F f | Heterozygous | Carrier (has no symptoms but carries the recessive allele) |
| f f | Homozygous recessive | Cystic fibrosis (has symptoms) |
Which parent is homozygous for the dominant trait?
~homozygous dominant parents means each parent has 2 dominant (rolling tongue) alleles. Therefore, each parent has no choice but to pass on those dominant alleles to their offspring (RR). All offspring, 4/4 will also be homozygous and able to roll their tongues.
What is the that a child will be homozygous or heterozygous?
Homozygous: You inherit the same version of the gene from each parent, so you have two matching genes. Heterozygous: You inherit a different version of a gene from each parent. They do not match.
What is the probability of a homozygous offspring?
If two heterozygotes are crossed, the probability that an offspring will be homozygous recessive is 25% or 0.25. Homozygous dominant: 25% or 0.25. Heterozygous: 50% or 0.50.
What are warning signs of cystic fibrosis?
Early signs of CF include:
- Salty sweat; many parents notice a salty taste when kissing their child.
- Poor growth and weight gain (failure to thrive)
- Constant coughing and wheezing.
- Thick mucus or phlegm.
- Greasy, smelly stools that are bulky and pale colored.