LCHS Unit 7 Review Biology

A recessive trait

• is always a white flower.

• is always expressed.

• is never expressed.

• is only expressed when there is no dominant allele.

What will the chromosomes look like after crossing over above?

• 
• 
• 
• 

Segregation (separation) in meiosis will result in

• genetically identical cells.

• gametes(N) with half the number of chromosomes that somatic cells have.

• cancer cells.

• a zygote.

A human has 46 chromosomes in its somatic cells. Gametes (sex) cells are different from the somatic (body) cells because they have

• 24 chromosomes.

• 22 chromosomes.

• 23 chromosomes.

• 92 chromosomes.

A diploid cell is

• (N) half the number of chromosomes.

• (2N) two full sets of chromosomes.

• same as haploid cells.

• All the answers.

Which of the following is characteristic of a dominant trait?

• lowercase letters only

• uppercase letters only

• a trait that is expressed in the phenotype only when an organism has two dominant alleles

• a trait that is expressed in the phenotype when an organism has at least one dominant allele

Where does telophase occur?

• Transcription

• Mitosis

• Translation

• S phase

What process is this and what type of cells does this produce?

• Mitosis, gamete cells

• Meiosis, somatic cells

• Mitosis, somatic cells

• Meiosis, gamete cells

The genotype expressed as its physical trait is called

• phenotype.

• mutation.

• chromosomes.

• genotype.

Why does sexual reproduction bring about greater genetic diversity than asexual reproduction?

• New combinations of genes result from sexual reproduction.

• Only mitosis has to occur in sexual reproduction.

• Asexual reproduction results in increased genetic variation.

• Binary fission occurs too slow for genetic variation.