Meiosis and Mutations

The diploid and haploid number of chromosomes in a gamete is represented by the symbol

• x

• y

• n

• z

If an organism’s diploid number is 12, its haploid number is

• 3

• 6

• 12

• 24

______ is a source of genetic variation that refers to a random error in the genetic code.

• Fertilization

• Mitosis

• Meiosis

• Mutation

Tags

NGSS.HS-LS3-2

Organisms are able to reproduce either sexually or asexually. Which of the following statements is true of these reproductive processes?

• The sorting of genes during asexual reproduction results in a large amount of genetic variation.

• The sorting of genes during sexual reproduction results in a large amount of genetic variation.

• During every cell division in sexual reproduction, the number of chromosomes is reduced by half.

• During every cell division in asexual reproduction, the number of chromosomes is reduced by half.

Tags

NGSS.HS-LS4-2

Sometimes, during the process of replication, the DNA code is copied incorrectly, and an incorrect nucleotide is attached to the new strand of DNA.

This incorrect copy is known as a

• Protein

• Codon

• Mutation

• Duplicate

Tags

NGSS.HS-LS3-2

During the process shown below, homologous chromosomes exchange genetic material.

What is this process called?

• Nondisjunction

• Translocation

• Jumping Genes

• Crossing over

How do mutations lead to genetic variation?

• by changing the organism's behavior

• by changing the organism's appearance

• by changing the way that the organism reproduces

• by producing random changes in an organism's genetic code

Tags

NGSS.HS-LS3-2

NGSS.HS-LS4-2

Chromosomes form tetrads during

• Prophase I of meiosis

• Metaphase I of meiosis

• Interphase

• Anaphase II of meiosis

What happens between meiosis I and meiosis II that reduces the number of chromosomes?

• Crossing-over occurs.

• Metaphase occurs

• Replication occurs twice.

• Replication does not occur

______ is a source of genetic variation that involves the swapping of sections of chromosomes during meiosis.

• Translocation

• Transcription

• Crossing over

• Fertilization