What percentage of the kittens will be calico and male?
According to Bell, research shows that fewer than 1 in 1,000 calico cats are male. This can be chalked up to the female’s extra X chromosome. “For a cat to be a calico, it must have two X chromosomes, and typically only female cats have two X chromosomes, says Dr.
What percentage of the kittens will be orange and female?
Only about 1 in 5 orange tabby cats is female. Scientists and researchers are fairly certain that orange tabbies’ color transpires from a sex-linked gene, with the X chromosome responsible for the orange coloring.
What fraction of the offspring will be carrier females?
50%
What if 100 males were produced and 200 females how many total red eyed flies would there be?
Math: What if in the above cross, 100 males were produced and 200 females. All females have How many total red eyed flies would there be? _250 red eyes = 200 – 3 of males have = 50 red eyes ore 250 Sex-Linked Traits Worksheet 1 of 2 Page 2 6. In humans, hemophilia is a sex linked trait.
What happens when a female who is normal marries a man who has hemophilia?
If she gets the X chromosome with the hemophilia gene, she will have hemophilia. A man who has hemophilia and a woman who is a carrier have: a 25% (one in four) chance of having a son with hemophilia. a 25% chance of having a son with normal blood clotting.
Which Cross would most likely produce 50% white-eyed males and 50% red-eyed males?
Crosses between true breeding white-eyed females and red-eyed males would result in 50% red-eyed females and 50% white-eyed males because the white eye trait is linked to the X-chromosome and males only inherit their X chromosome from their mother.
What is the genotype of a red eyed male?
Homozygous dominant for the red encoding allele – genotype: XWXW; phenotype: red eyes. Heterozygous – genotype XWXw; phenotype: red eyes. Homozygous recessive with two white encoding alleles – genotype XwXw; phenotype white eyes.
Why is it impossible to have a tortoiseshell male offspring?
A veterinarian has adopted a tortoiseshell cat that she claims is a “genetic impossibility” because it is male. Male cats, like human beings, have only one X chromosome in their DNA meaning that they should be unable to inherit different colours.
What percentage of male offspring will be hemophiliacs?
Each daughter has a 1 in 2 (50%) chance of getting her mother’s hemophilia allele and being heterozygous. Overall, there is a 1 in 4 (25%) chance for each pregnancy that the baby will be a son with hemophilia and a 1 in 4 (25%) chance that the baby will be a heterozygous daughter.
Why is hemophilia more common in males?
These disorders affect males more often than females because females have an additional X chromosome that acts as a “back-up.” Because males only have one X chromosome, any mutation in the factor VIII or IX gene will result in hemophilia.
Is Hemophilia more common in males?
Hemophilia occurs more commonly in males than in females. The two most common types of hemophilia are hemophilia A (also known as classic hemophilia) and hemophilia B (also known as Christmas disease).
Which is worse hemophilia A or B?
Hemophilia A affects 1 in 5,000 to 10,000 males. Hemophilia B is less common, affecting 1 in 25,000 to 30,000 males. Around 60% to 70% of people with hemophilia A have the severe form of the disorder and about 15% have the moderate form. The rest have mild hemophilia.
How long is the average lifespan of a person with hemophilia?
During this period, it exceeded mortality in the general population by a factor of 2.69 (95% confidence interval [CI]: 2.37-3.05), and median life expectancy in severe hemophilia was 63 years.
What is cystic fibrosis life expectancy?
While there is no cure yet for cystic fibrosis (CF), people with CF are living longer, healthier lives than ever before. In fact, babies born with CF today are expected to live into their mid-40s and beyond. Life expectancy has improved so dramatically that there are now more adults with cystic fibrosis than children.
At what age is hemophilia diagnosed?
In the United States, most people with hemophilia are diagnosed at a very young age. Based on CDC data, the median age at diagnosis is 36 months for people with mild hemophilia, 8 months for those with moderate hemophilia, and 1 month for those with severe hemophilia.
What race is most affected by hemophilia?
The average age of persons with hemophilia in the United States is 23.5 years. Compared to the distribution of race and ethnicity in the U.S. population, white race is more common, Hispanic ethnicity is equally common, while black race and Asian ancestry are less common among persons with hemophilia.
Who is most at risk for hemophilia?
For this reason, most people with hemophilia A are male. If a woman has a defective factor VIII gene, she is considered a carrier. This means the defective gene can be passed down to her children. Boys born to such women have a 50% chance of having hemophilia A.