Biology MCQ

Sarah and Tom are expecting their first child. Sarah's maternal uncle has hemophilia, a genetic disorder that affects blood clotting. Sarah is concerned about the risk of passing hemophilia to her child. Sarah's father is unaffected by hemophilia, but her mother is a carrier of the disorder. Tom has no family history of hemophilia but Sarah is also a carrier of disease. What is the likelihood that Sarah and Tom's child will have hemophilia?

Assertion (A): In humans, the sex of the offspring is determined by the type of sex chromosome contributed by the father.
Reason (R): Females have two X chromosomes, while males have one X and one Y chromosome.

Assertion (A): A carrier of a genetic disorder is always affected by the disorder.
Reason (R): Carriers are individuals who have one copy of a recessive allele for a genetic disorder but do not show symptoms of the disorder.

Assertion (A): Mendel's law of segregation states that during the formation of gametes, the alleles segregate from each other so that each gamete carries only one allele for each gene.
Reason (R): This segregation of alleles occurs during anaphase I of meiosis.

The disease 'colour blindness' is a

Sex linked inheritance is seen in

Which of the following is called Bleeder's disease?

In some individuals, the blood group is AB type. They have both type A and type B blood. This is an example of

The genes which are never passed from father to son is

Gametes are always pure. It is confirmed by

The tendency of genes to remain in their parental combination is called

Holandric genes are mainly

A single gene is responsible for a variety of traits. This is called

Purity of gametes is linked to

What are examples of genetic diseases?

Skin colour of human is an example of

Mendel chose pea plant for his experiment because

State which of the following statements is false.

In the egg cell