Zoology MCQs for Lecturer PPSC FPSC KKPSC SPSC Test No. 41

If a heterozygous plant is allowed to self-pollinate, what proportion of the offspring will also be heterozygous?

If each parent can produce 100 genetically distinct gametes, how many genetically distinct offspring can two parents produce?

A single genetic locus that controls more than one trait is said to be____.

Which choice below describes the Tay- Sachs allele at the molecular level?

If an organism has been designated Tt, it is_____.

When the genotype of an individual is unknown, what kind of cross should be made?

Pea flowers may be purple (P) or white (p). Pea seeds may be round (R) or wrinkled (r). What proportion of the offspring from the cross PpRr x PpRr will have white flowers and wrinkled seeds?

Huntington's disease is an example of a genetic disorder caused by___.

Who was the work of Mendel unique compared with that of others studying plant genetics at the time?

A man who has type B blood and a woman who has type A blood could have children of which of the following phenotype?

Which of the following matings cannot produce a child with blood type O? The letters refer to blood types (phenotypes).

Organisms that vary from the  wild type are called_____.

A red bull is crossed with a white cow and all of the offspring are roan, an intermediate colour that is caused by the presence of both red and white hairs. This is an example of genes that are____.

The typical phenotypic ratio expected from a  monohybrid cross involving simple dominance is ___.

A couple both descended from eastern European (Ashkenazic) Jews, visit a genetic counselor before trying to have children. In view of their enthic background, the counselor recommends that they be tested to see if they are carriers for___

Which human disorder is inherited as an autosomal dominant?

The basic unit of inheritance is a (n)__.

 A woman with type O blood is expecting a child. Her husband is type A . Both the woman's father and her husband's father had type B blood What is the probability that the child will have type O blood?

An AABbccDdEeFF  individual is crossed with an individual with the genotype AaBBCCDdEeff. What is the probability that their offspring will have the genotype AaBBCcddEEFf?

Michelle and Keith are apparently normal, but their daughter was born with alkaptonuria, an inherited metabolic disorder.If alkaptonuria is like most other human hereditary disorders, the probability of their next child being born with alkaptonuria is____

Tay-Sachs disease runs in Rebecca's family On a family pedigree, she  saw a shaded circle this represents a____

Tom's brother suffers from phenylketonuria (PKU) a recessive disorder. The brother's parents do not have PKU.  What are the chances that Tom, who is normal for this trait, is a Carrier of PKU?

Mendel's pea plants had either yellow or green unripe pods. These characteristics represent an organism's ____.

An individual with the genotype AABbCcDD can make how many different kinds of gametes?

In a typical pedigree chart, a half filled circle indicates a___.