Activity 14Genes and Chromosomes

Activity 14: Genes and Chromosomes

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Activity 14: Genes and Chromosomes

Get Started

How does the behavior of chromosomes in cells help to explain the behavior of genes that are passed from one generation to the next?

Read the introduction.

Activity 14: Genes and ChromosomesActivity 14: Genes and Chromosomes

How do genes and chromosomes behave during meiosis and sexual reproduction?

Challenge

Activity 14: Genes and Chromosomes

Procedure

Student Sheet 14.1, “Three-level Reading Guide: Genes and Chromosomes,” presents statements that require three levels of understanding. Determine which statements are supported by the text.

Activity 14: Genes and Chromosomes

Procedure

Crossing Over

Activity 14: Genes and Chromosomes

Follow Up

Explain the relationship between genes, chromosomes, and DNA.

Analysis 1

Activity 14: Genes and Chromosomes

Follow Up

A species of snail has 24 chromosomes—12 pairs—in each somatic cell. How many chromosomes are there in a snail egg cell? A snail sperm cell?

Analysis 2

Activity 14: Genes and Chromosomes

6. The chromosomes pictured below are from a fruit fly that is heterozygous for two traits. How many kinds of gametes could form if this were in a male? A female?

7. Consider your answer to Question 6. Explain how crossing over could affect the gametes that result.

Analysis 6 and 7

Activity 14: Genes and ChromosomesActivity 14: Genes and Chromosomes

How do genes and chromosomes behave during meiosis and sexual reproduction?

Revisit the Challenge

Activity 14: Genes and Chromosomes

Key Vocabulary

chromosome crossing over diploid gamete gene haploid karyotype

law of independent assortment

meiosis mitosis nondisjunction somatic cell

Key Vocabulary