Genetics Remediation

Genetics Remediation

If you are here, you scored less then 70% on your exam. In order for you to move on, you must complete this activity.

Key Vocabulary

• Genes: region of DNA that codes for specific traits

• Alleles: different copies of the same gene

• Genotype: Gene combination for a specific trait

• Phenotype: physical trait that is shown in organism

Multiple Choice

Genotype refers to the ...

• physical expression of the genes

• the possible combination of alleles in a gene

• whether an allele is dominant or recessive

• how an organism will appear

Multiple Choice

Phenotype refers to the...

• Expressed physical trait of an organism

• Genetic combination of an organism

• Whether an allele is dominant or recessive

• The possible combination of alleles

Multiple Choice

blue eyes, curly hair

• genotype

• phenotype

Multiple Choice

Tt, BB, rr

• genotype

• phenotype

Key Vocabulary

• Homozygous- refers to having 2 of the same alleles (Homo=same)

• Heterozygous-refers to having 2 different alleles (Hetero= different)

• Dominant: always shown physically when present. Represented by capital letter

• Recessive: takes two copies to be shown physically. Not seen in heterozygote, Represented by lowercase letter

Multiple Choice

nn, ww, gg

• heterozygous

• homozygous dominant

• homozygous recessive

Multiple Choice

Tt, Bb, Ww

• heterozygous

• homozygous dominant

• homozygous recessive

Multiple Choice

BB, RR, TT

• heterozygous

• homozygous dominant

• homozygous recessive

Multiple Choice

How would you write a homozygous dominant genotype?

• AA

• Aa

• aa

• either AA or Aa

Multiple Choice

Which of the following best describes the genotype "Rr"?

• recessive

• heterozygous

• purebred

• all of the above

Multiple Choice

having two different genes for a trait (sometimes called hybrid).

• protein

• homozygous

• heterozygous

• genotype

Multiple Choice

having two of the same genes for the trait (sometimes called purebred).

• homozygous
• hetrozygous
• protein
• chromosome

Punnett Squares

• Scientists used Punnett Squares to create show the different possibilities of offspring that can be created based off the parent's genes

Punnett Square

To create a Punnett square, you look at each parent's genotype. Each genotype has 2 alleles. Each parent can only give 1 allele to their offspring. For each square, write one of the parent's alleles.

Punnett Square

Dad (top) would have 1/2 sperm with A and 1/2 sperm with a. Mom (side) would have 1/2 eggs with A and 1/2 eggs with a. Inside each box, you create the different genotype combinations for each child based the alleles inside of the sperm and eggs. Example Top left box, A sperm meets A egg. Top right box a sperm meets A egg. Bottom left A sperm meets a egg. Bottom right a sperm meets a egg.

Punnett Squares

Once the Punnett squares are completed, you analyze the genotypes and phenotypes of the offspring. 1 child is AA, 2 are Aa, 1 is aa. This is the genotype ratio 1:2:1. The genotype percent is 25% AA, 50% Aa and 25% aa. The phenotype is 3:1. With 3 showing the dominant trait and 1 showing the recessive trait. Remember the heterozygotes shows the DOMINANT TRAIT.

Multiple Choice

Georgette wants to breed her pet phoenixes, but she isn't sure if the babies will burst into blue flames or red flames. Her documents show that her female phoenix is homozygous dominant for red flames, while her male phoenix is homozygous recessive for blue flames. What color flames will the babies have?

• Red
• Blue
• Purple
• 50% Red, 50% Blue

Multiple Choice

What is the probability of a purple-horned unicorn if a heterozygous pink-horned unicorn is crossed with a heterozygous pink-horned unicorn?

• 0%
• 25%
• 50%
• 75%

Multiple Choice

A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?

• 0%
• 25%
• 50%
• 75%

Multiple Choice

In the Punnett square shown, what must the genotype of the missing parent be?

• BB
• Bb
• bb
• Tt

Multiple Choice

B - black, b - brown.  Two black mice mate and have some black and some brown mice.  What is the genotype of the parents?

• BB x Bb
• BB x bb
• Bb x Bb
• Bb x bb

Multiple Choice

What is the mother's genotype?

• DD

• Dd

• dd