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If a female carrier for hemophilia mates with a healthy male who doesn't have hemophilia what are the expected genotypes and phenotypes of their children?
Wiki User
∙ 14y ago
Haemophilia is a recessive, X-based disorder. The woman in your question is a carrier, meaning she has the defective gene, but isn't bothered by it. Therefor, the woman is of the type 'Xx'. The man is of the type 'XY', not carrying the defective gene. Their children can then be: XX, xX, XY, xY. This means that their daughters won't be affected by it, but might carry it, and their sons either not carry it at all, or carry it and be haemophilic.
Wiki User
∙ 14y ago
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What genotype is produced by the phenotype B?
Genotypes are not created by phenotypes, they are the alleles/genes of the organism. Genotypes (in combination with environment) produce phenotypes. It would be expected that the genotypes Bb and BB would produce the phenotype B.
What is the probability that two people with genotype LlRr have five children and 3 of them are dominant for the two genes L R?
With a dihybrid cross, there are 9 possible genotypes and 4 possible phenotypes. The ratio of phenotypes expected is 9 LR : 3 Lr : 3 lR : 1 lr. The probability of a homozygous dominant for both traits is 1/16 or 6%. The probability of having a dominant phenotype for both traits is 9/16 or 56%. 9/16 is roughly equal to 3/5 - so this is the expected ratio.
When two loci are on the same chromosome the phenotypes of the progeny sometimes do not fit the phenotypes predicted?
The same reason that dice don't always roll numbers as expected. Random chance. genetic propagation of traits is much more complex and therefor even less predictable than dice.
How many of their female children might be expected to be color blind dwarfs?
None
Why does the expected genotype ratio often differ from expected phenotype ratio from a monohybrid cross?
This would be because phenotypes are the observable characteristics whilst genotypes are the actual genes. If we are given the genes: R (dominant) and r (recessive), and 2 organisms with Rr genes (one dominant and one recessive) produce offspring, their offspring will have one of the following genes, with the percentage chance in brackets: RR (25%) Rr (50%) rr (25%) However, you can't detect recessive genes if a dominant gene is present, thus there will be no observable difference between the RR and Rr organism, besides for their offspring. Thus, the phenotype is 75% and 25%, unlike for the genotype.
What genotype is produced by the phenotype B?
Genotypes are not created by phenotypes, they are the alleles/genes of the organism. Genotypes (in combination with environment) produce phenotypes. It would be expected that the genotypes Bb and BB would produce the phenotype B.
How does a punnett square show precetages of phenotypes and geneotypes?
Punnett Squares do not directly tell you the percentages of phenotypes and genotypes, it tells you the probability of the expected genotypes. Based on the Punnett Square, you can infer about the genotypic and phenotypic ratios.
How do you find possible phenotypes in offspring?
The possible genotypes and phenotypes of the offspring can be determined using a Punnett square, a grid that shows the possible combinations of alleles that can result at fertilisation. The Punnett square below shows the expected genotypes of the offspring of parent pea plants that both have the genotype Rr.
What is the probability that two people with genotype LlRr have five children and 3 of them are dominant for the two genes L R?
With a dihybrid cross, there are 9 possible genotypes and 4 possible phenotypes. The ratio of phenotypes expected is 9 LR : 3 Lr : 3 lR : 1 lr. The probability of a homozygous dominant for both traits is 1/16 or 6%. The probability of having a dominant phenotype for both traits is 9/16 or 56%. 9/16 is roughly equal to 3/5 - so this is the expected ratio.
How much do the expected genotypes of 100 offspring with the observed genotypes disagree?
I it AA in both parent
More phenotypes than expected may result from polygenic inheritance because of what?
pleiotropy
How do you find possible phenotypes of offspring?
Mendel Diagrams. If the offspring gets a dominate gene from both parents, the offspring will exhibit traits from the dominate gene. If the offspring gets a dominate gene from one parent and a recessive gene from another, the offspring will exhibit traits from the dominate gene. If the offspring get a recessive gene from both parents, the offspring will exhibit traits from the recessive gene.
What are the results of a cross between parents with genotypes Cc and cc?
The expected results are half Cc and half cc.
Why do traits that are controlled by genes on the same chromosome not always appear in the expected ratio in offspring?
I think this has something to do with "crossing over," but I do not remember the details. All I remember is that the allelle of one chromosome may overlap and switch with the allelle of another chromosome, which results in unexpected ratios of the genotypes and phenotypes of traits represented by genes that would normally be found on the same chromosome.
What are a toddler aPTT values with hemophilia A?
anythimg longer than the expected value reference range, which is 25-39secs
A grasshopper with red stripes mates with a grasshopper with yellow stripes What ratio would you expect to see in the phenotypes of their offspring?
If a grasshopper with red stripes mates with a grasshopper of yellow stripes, there is a ratio of phenotypes present. A 75-25 ratio would be expected of red to yellow stripes.
What is meant by observed genotypes?
A phenotype is a physical characteristic. For a human an observed phenotype example would be hair colour (e.g brown) or eye colour (green). An observed phenotype is a physical characteristic that can be seen directly or indirectly (internal organs) caused by an individual's genotype.
