Variation(Senior Class Biology Study by Topics Test) : GATE Academy

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The difference between a monohybrid cross and a dihybrid cross is that

Monohybrid crosses involve traits for which only one allele exists, while dihybrid traits involve two alleles.

Dihybrid crosses require two Punnett squares; monohybrid crosses need only one.

Monohybrid crosses involve self-pollination, while dihybrid crosses involve cross-pollination.

Monohybrid crosses involve one trait; dihybrid crosses involve two traits.

Fish is invertebrates.

False

True

Genes of a flower colour in Mirabilis jalapa show incomplete dominance. In a cross between red and white flowered plant, all the F, plants are pink flowered. If these plants are self pollinated, the phenotypic ratio in the F 2 generation will be

3 : 1

1 : 2 : 1

1 : 1

9 : 3 : 3 : 1

Cause of Down's syndrome is

Nondisjunction of chromosomes

Iinkage

Sex linked inheritance

Crossing over

Different versions of the same gene are known as

Chromosomes

Centromeres

Gametes

Alleles

Why are viruses considered as non-living

Because they dont meet the criteria of the "7 ways of life"

Because they dont have a nucleus

They act like parasites

They are made up of cells

Which of the following is associated with Y chromosome?

Haemophilia

Hypertrichosis of ears

Colour blindness

Night blindness

Cystic fibrosis and sickle cell disease are examples of

Osmoregulation

Inherited recessive genetic disorders

Pedigree analysis

Monohybrids

Which of the following is an australian animal which is also a mix of both mammal and bird

Ostrich

Yellowhammer

Zorse

Platterpuss

10.

Charles Darwin was the first one to consider environment, migration, overcrowding, and isolation of populations as factors that could influence evolution.

True

False

11.

What does heterozygous mean

having two identical alleles of the same gene

one out of two or more versions of a gen

having two different alleles of the same gene

an allele that is only expressed if there is no dominant allele present

12.

A larkey that is homozygous for red eyes(EE) mates with a larkey that is homozygous for gray eyes(ee). What percent chance will their offspring have gray eyes?

75%

25%

None of the above

50%

13.

What is genetic variation

is aquired characteristics caused by environmental factors

inherited characteristics caused by mutation or reproduction

there are no intermediates, but rather distinctly different groups

this is when characteristics are spread over a range of values

14.

The process of removing stamens of a flower during hybridization is called

Hybridization

Sterilization

Crossing

Emasculation

15.

In hemophilia Patients

Erythrocytes are absent

Erythrocytes are nucleated

Blood clotting is delayed due to the lack of certain clotting factors

Platelets are absent

16.

FF-striped fur, Ff- solid fur, ff- spotted fur Two larkeys with solid fur mate. Which fur will their offspring most likely have?

Striped

Spotted

Solid

17.

Sexual reproduction in animals depends on the production of gametes. Choose all the processes below that produce gametes in animals?

Protein synthesis

Mitosis

Meiosis

Fertilization

18.

When traits from the parents blend together in the offspring, it is called

A goofy looking offspring

Codominance

Incomplete dominance

Complete dominance

19.

Which of the following processes allows for cells to divide to produce new cells that contain all of the necessary information to survive?

DNA Replication

MRNA translation

DNA transcription

Cellular Reproduction

20.

Most of Darwin's observations about changes in species over time and in different environments took place in and near

South America.

Asia

Africa.

North America.

21.

When a woman has a gene for a disorder, but does not show any sign of that disorder, she is called a

Hemophiliac

Weirdo

Sex-linked trait

Carrier

22.

Genetics is the branch of biology that involves the study of how different traits are transmitted from one generation to the next.

True

False

23.

Darwin's observation that there were Patagonian hares but no rabbits in South America was most closely related to his consideration of

The fossil record. .

Comparative anatomy.

Comparative embryology

Biogeography.

24.

Lamarck's theory of evolution included the idea that

There is a natural force in all living things that pushes them toward perfection.

Species are only produced through special creation.

Species are fixed and unchanging over time

Local catastrophes cause mass extinctions of species.

25.

There is no similarities between human DNA and DNA other of mammals such as chimpanzees

False

True

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