In human rolling of tongue is an autosomal dominant trait(R). In a family both the parents have the trait of rolling tongue but their daughter does not show the trait, whereas the sons have the trait of rolling of tongue.
The genotypes og the family would be:

Sita's father has haemophilia,an X-linked recessive trait ,but her husband does not.What is the chance that her son will have the disease ?

A man is affected with brachydactyly, an autosomal dominant trait that cause shortening of several fingers. What is the risk that the man's first child will have brachydactyly ?

Free ear lobe in humans is an autosomal dominant trait. The recessive individuals show fused ear lobes.A child with fused ear lobes is born to a couple who have free ear lobes. What is the probability of their next child to be with free ear lobes?

In a family, the father has a trait but the mother did not. All their sons and daughters has this trait. The same trait was found in some grand daughters, though daughters were married to normal persons. In this pedigree the genotypes of the father , mother and husband of daughter are

A couple has three children : a 14 - year -old daughter and two sons that are 12 and 10 years old.If the mother and daughter are both known to have a genetic disorder what would the the Pedigree of this family look like?

Sickle cell anemia is a genetic disorder where the body produces an abnormal hemoglobin called hemoglobin S. Red blood cells are normally flexible and round, but when the hemoglobin is defective, blood cells take on a “sickle” or crescent shape. Sickle cell anemia is caused by mutations in a gene called HBB. It is an inherited blood disorder that occurs if both the maternal and paternal copies of the HBB gene are defective. In other words, if an individual receives just one copy of the defective HBB gene, either from mother or father, then the individual has no sickle cell anemia but has what is called “sickle cell trait”. People with sickle cell trait usually do not have any symptoms or problems but they can pass the mutated gene onto their children. There are three inheritance scenarios that can lead to a child having sickle cell anemia: - Both parents have sickle cell trait - One parent has sickle cell anemia and the other has sickle cell trait - Both parents have sickle cell anemia If one parent has sickle cell anemia and the other has sickle cell trait, there is __________that their children will have sickle cell anemia and ___________will have sickle cell trait.

If a cross is made between TtRr x TtRr in garden pea (w.r.t plant height and flower colour), what is the probabilty of the having individuals heterozygous for both traits?

In guinea pigs, black fur (B) is dominant over white fur (b) and rough four ( R ) is domiant over smooth fur ( r ) . A cross between two Guinea pigs hybrid for both traits (BbRr x BbRr) produces some offsprings that have rough, black fur and some that have somooth, black fur. The genotypes of these offsprings illustrate the genetic concept of