Zoology MCQs for Lecturer PPSC FPSC KKPSC SPSC Test No. 42

Identical twins result when a single fertilized egg divides in two. Another term for identical twin is ___.

If a fragment of a chromosome breaks off and then reattaches to the original chromosome at the same place but in the reverse direction, the resulting chromosomal abnormality is called___.

If 60 out of 100 cats that inherit the dominant allele  for polydactyly actually have extra digits the allele is said to be____.

In an X- linked, or sex- linked, trait it is the contribution of____ the determines whether a son will display the trait.

A cross of a red flowered Snapdragon plant with a white- flowered Snapdragon produces a plant with pink flowers. This is an example of____.

ABO blood type is an example of which type of dominance?

Marfan syndrome and porphyria were historically difficult to trace through families or determine their mode of inheritance because of the variety of symptoms of each disease. Disorders or traits with many symptoms are____.

Humans are diploid and have 46 chromosomes. How many chromosomes are found in each human gamete?

Human mitochondria____.

A particular allele can have different effects if it is inherited from a male rather than a female. This phenomenon is known as____.

___ is the process by which haploid gametes form a diploid zygote.

Humans are diploid and have 46 chromosomes ( or two sets). How many sets of chromosomes are found in each human gamete?

If two genes are linked, __.

How many map units is a recombination frequency of 5% equal to?

Mutant tetraploid plants____.

What is the probability that a male will inherit an X- linked recessive allele from his father?

Using the product rule, what is the likelihood of obtaining a RRYY plant from dihybrid ( RrYy) parents?

The most common phenotype in a natural population is referred to as the____.

Which of these terms applies to an  organism with extra sets of chromosomes?

A ___ appears to be an  inherited trait but is instead  caused by an environmental factor.

A particular diploid plant species has 48 chromosomes, or two sets. A mutation occurs and gametes with 48 chromosomes are produced. If self fertilization occurs, the  gametes will have____ set(s) of chromosomes.

Linked genes can be separated by anywhere from___ to ____ centimorgans.

Lethal alleles are usually:

Both chloroplasts and mitochondria___.

Most polyploid plants arise as a result of___.