In humans, freckles are dominant to no freckles. A man with freckles is married to a woman with freckles, but the children have no freckles. What's the reason?2 9276
In horses, B = black, b = brown, T = trotter, t = pacer. A black pacer mated to a brown trotter produces a black trotter offspring year after year. What are the probable genotypes?1 3868
In human beings, brown eyes are usually dominant over blue eyes. Suppose a blue-eyed man marries a brown-eyed woman whose father was blue-eyed. What proportion of their children would you predict to have blue eyes?1 15486
A brown-eyed man whose father was brown-eyed and whose mother was blue-eyed married a blue-eyed woman whose mother and father were both brown-eyed. The couple has a blue-eyed son. What are the genotypes of all individuals?1 6789
In hogs a gene that produces a white belt around the animal's body is dominant over its allele for a uniform body. Another independent dominant gene produces fusion of the hoof (syndactyly). Suppose a uniformly colored hog homozygous for syndactyly is mated with a normal footed hog homozygous for the belted character. What would be the phenotype of the F1? If the F1's interbreed, what would be the phenotypic ratio of the F2?3473
For each of the following, state whether it is a gamete or a genotype of an individual a) TT b) Tg c) IcCC d) TW2 2129
The gene for tallness (T) is dominant over the gene for shortness (t) in pea plants. A homozygous dominant pea plant is crossed with a heterozygous pea plant, and 200 seeds are produced. Approximately how many of these seeds can be expected to produce plants that are homozygous dominant?3 7520
People who can roll their tongues contain a dominant allele for tongue rolling. If people do not contain the tongue rolling gene, then they cannot roll their tongue no matter how hard they try. Consider the following situation: If a homozygous dominant tongue roller mates with a homozygous recessive non-tongue roller, then what is the probability of the offspring inheriting the tongue rolling gene?2 8118
Why are some people born with Rh-positive blood while others are born with Rh-negative blood1 2489
What is Genetic Engineering?1 815
What are the differences between Genetic Engineering and breeding?1 1551
Does Genetic Engineering harm or benefit human society?1 5528
In the definition of mutation we say sudden heritable change i the DNA, so what does sudden means here?
The ABO blood system has been employed to settle cases of disputed paternity. Suppose, as an expert in genetics, you are called to testify in a case where the mother is type A, the child is type O and the alleged father is type B. How would you respond to the following statements of the attornies: a. "Since the mother has type A, the type O of the child must have come from the father and since my client is type B, he obviously could not have fatered the child." Made by the attorney of the alleged father. b. "Further tests revealed that this man is heterozygous and therefore he must be the father." Made by the mother's attorney.
Different between back cross and test cross
Can you name a few potential risks of Genetic Engineering?
Cystic fibrosis (CF) occurs with a frequency of about 1/2500 Caucasian newborns and is inherited as an autosomal recessive. A woman had an older sister die from complications of this disease. CF is not present among relatives of her husband. Both the woman and her husband have normal phenotypes. What is the chance this couple will have a CF child?
Is Jurassic Park -- Completely impossible?
Why would farmers, doctors, and manufacturers be interested in Genetic Engineering?
how was school like for someone with turner's syndrome?
What are the down sides of Genetic Engineering?
What situations might be viewed as ethical uses of human cloning? Are you doubtful, fearful, or hopeful about human cloning?
A base deletion occurs in the regulator gene of the LAC operon. Describe how the operation of the LAC operon might be affected?
In mice colored coat is dominant to albinism. Sniffles, a male mouse with a colored coat is mated to Esmeralda, an alluring albino. The resulting litter of six young all had colored fur. The next time around Esmeralda was mated with Whiskers, who was the same color as Sniffles; some of this litter were white. a)What are the probable genotypes of Sniffles, Esmeralda, and Whiskers? b) If a male of the 1st litterwas mated to a colored female of the 2nd litter, what phenotypic ratio might be expected among the offspring? c)What would be the expected results if a male of the 1st litter was mated to an albino from the 2nd?
what causes heterosexuality?
Explain in terms of gene product function how a mutant allele can be dominant? recessive?
Does a person diagnosed with turner syndrome have trouble hearing? please reply if you have this syndrome or know someone who does.