Author: Judy Jones

Mitosis Phases—Put In Order

Mitosis Versus Meiosis

How are Mitosis and Meiosis similar and or different in terms of:
Replication:
Separation of DNA:
Change in Chromosome Number:
Number of Cell Divisions:
Number and Kind of Cells Produced:
Variation:

Importance of Variation

How do each of the following lead to greater variation and diversity?
Crossing over:
Random Assortment of Chromosomes (during cell division):
Fertilization:

The Role of the
Environment
Multifactorial Inheritance: Explain how the environment and genetics interact to produce a phenotype.
Examples:

Genetics
Information Organizer

Vocabulary

Genotype:
Phenotype:
Dominant:
Recessive:
Heterozygous:
Homozygous:
Co-Dominant:
Incompletely Dominant:
Polygenic Traits:
Independent Assortment:

Genetics Problems

1. What are the possible gamete combinations for the following genotypes?
Aa
AaBb

A person heterozygous for Widow’s peak has children with another person who is heterozygous for Widow’s Peak. Show the cross and the possible offspring. Give the genotypic and phenotypic ratios.

White and Red are incompletely dominant. WR produces pink flowers. Show the cross between two pink flowers and give the genotypic and phenotypic ratios.

Test Cross

What is a test cross used to determine?
Show how you would do a test cross to discover the genotype of a Tall Pea Plant?

Parental, F1 and F2
Generations
(Review Mendel’s )
Use Tall and Short pea plants to show the parental genotypes, the F1 generation and the F2 generation.

Multiple Alleles

In rabbits, Full color (C) is dominant to chinchilla color (Cch). Chinchilla is dominant to Ch—Himalayan and Himalayan is dominant to Albino (c). A full color rabbit is crossed with a chinchilla. Among the offspring are some full color, some chinchilla and some albino. Give the genotypes of the parents and show the cross.

Using Data

Two short-haired guinea pigs are mated. After several matings, they have produced 70 short-haired offspring and 25 long-haired offspring. How is hair length inherited?
What are the genotypes of the parents (use H and h)?
What is the predicted ratio of Short-hair to Long-hair in the offspring?