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Questions and Answers

What is the correct definition of a test cross in genetics?

A cross involving multiple traits at once

A cross between two hybrid organisms with the same alleles

A cross between a homozygous recessive and an organism of unknown genotype (correct)

A cross between two purebred organisms with different traits

Which of the following terms correctly describes an organism with two identical alleles for a trait?

Dominant

Hybrid

Homozygous (correct)

Heterozygous

What is the defining characteristic of co-dominance in genetic inheritance?

There is a blending of traits in the phenotype

One allele completely masks the effect of another

Both alleles are expressed equally in the phenotype (correct)

Only one allele is expressed in the offspring

What is semiconservative replication of DNA?

Replication where one old strand and one new strand form each new DNA molecule Signup and view all the answers

What role does DNA polymerase I play in DNA replication?

Removes RNA primers and fills in gaps with DNA Signup and view all the answers

Which of the following describes a phenotype influenced by multiple genes?

Polygenic inheritance Signup and view all the answers

What is the main function of helicase during DNA replication?

To unwind and separate the double-stranded DNA Signup and view all the answers

How does the environment influence phenotypes?

By interacting with genes to affect traits Signup and view all the answers

What is the primary role of mitosis in multicellular organisms?

To facilitate growth and repair of tissues Signup and view all the answers

During which stage of meiosis does crossing over occur?

Prophase I Signup and view all the answers

Which term describes cells that contain two sets of chromosomes?

Diploid Signup and view all the answers

What is the primary purpose of cytokinesis following mitosis?

To divide the cytoplasm between daughter cells Signup and view all the answers

What is a common result of nondisjunction during meiosis?

Production of gametes with an abnormal number of chromosomes Signup and view all the answers

What is the function of cyclins in the cell cycle?

To activate protein kinases that regulate progression through the cycle Signup and view all the answers

How do autosomes differ from sex chromosomes?

Sex chromosomes are involved in determining gender, while autosomes do not Signup and view all the answers

What characterizes a malignant tumor compared to a benign tumor?

It can metastasize and invade surrounding tissues Signup and view all the answers

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Questions and Answers

What is the correct definition of a test cross in genetics?

Which of the following terms correctly describes an organism with two identical alleles for a trait?

What is the defining characteristic of co-dominance in genetic inheritance?

What is semiconservative replication of DNA?

What role does DNA polymerase I play in DNA replication?

Which of the following describes a phenotype influenced by multiple genes?

What is the main function of helicase during DNA replication?

How does the environment influence phenotypes?

What is the primary role of mitosis in multicellular organisms?

During which stage of meiosis does crossing over occur?

Which term describes cells that contain two sets of chromosomes?

What is the primary purpose of cytokinesis following mitosis?

What is a common result of nondisjunction during meiosis?

What is the function of cyclins in the cell cycle?

How do autosomes differ from sex chromosomes?

What characterizes a malignant tumor compared to a benign tumor?

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