Mendelian Genetics Lesson

Multiple Choice

If your genotype is Bb, then you can only pass a B or b to your child but you can't pass both.

• Law of Dominance

• Law of Segregation

• Law of Independent Assortment

Multiple Choice

Different traits are inherited independently of each other

• Law of independent assortment

• Genetics law

Multiple Choice

A recessive allele is only expressed when a dominant allele is not present

• Law of dominance

• Law of inheritance

Multiple Choice

Mendel also observed seed color in pea plants. In a study of several generations, yellow seeds appeared more frequently than green seeds. Which of the following is most likely the reason for this observation?

• Green seeds are dominant to yellow seeds.

• Yellow seeds are recessive to green seeds

• Green seeds are recessive to yellow seeds.

Multiple Choice

Which of the following best describes a GENOTYPE?

• The allele/genetic makeup of an organism.
• The physical expression of a trait.

Multiple Choice

Which of the following is correct?

• Yy is homozygous dominant.

• YY is heterozygous.

• yy is homozygous recessive.

• YY is homozygous recessive.

Multiple Choice

Which of the following represents a heterozygous genotype?

• Aa

• AA

• aa

• Ab

Multiple Choice

Which of the following best describes Mendel's law of dominance?

• When an organism has two different alleles of the same gene, both genes will be expressed equally.

• When an organism has two alleles, one of genes will be expressed and the other will be hidden.

• When an organism has two different alleles of the same gene, one will always be dominant.

• The stronger of the two genes will be expressed.

Multiple Choice

A recessive trait would appear in the phenotype of which of these?

• BB

• bb

• Bb

• Bf

Multiple Choice

A __________ is a segment of DNA that codes for a particular protein, which leads to a particular trait.

• Gene
• Allele
• Codon
• Nucleotide

Multiple Choice

The letters on the TOP AND SIDE of a punnett square represent ______________.

• The combination of alleles in offspring.
• The possible alleles given by the parents following meiosis.
• The genotype and phenotype of offspring.
• The results of genetic mutations in offspring.

Multiple Choice

What is the predicted percentage of homozygous recessive offspring in this cross?

• 0%

• 25%

• 50%

• 75%

Multiple Choice

The physical expression of a genetic trait is called a

• mutation

• genotype

• crossing over

• phenotype

Multiple Choice

T - tall and t = short
In the punnett square below, what belongs in the missing square

• tt
• Tt
• Bb
• TT

Multiple Choice

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed? (B=brown eyes and b=blue eyes)

• 0 %

• 25%

• 50%

• 75%

Multiple Choice

Objective #5

(B-brown eyes & b-blue eyes)

Cross (Dad)Bb X (Mom)BB.

List the possible genotypes from this cross.

• BB, Bb, bb

• BB

• BB, Bb

• bb,Bb

Multiple Choice

If green is dominant over purple, then what is the genotype for this individual?

• Purple
• Green
• GG
• gg

Multiple Choice

Another word for homozygous is...

• purebred
• hybrid
• heterozygous
• dominant

Multiple Choice

D = dimples        d = no dimples 
What is the genotype for a homozygous recessive offspring?

• DD
• Dd
• dd

Multiple Choice

What is the phenotype of the offspring? (A-Brown hair; a-blond hair) 

• 50 % Brown Hair and 50% Blond Hair 
• 25 % Brown Hair and 75% Blond Hair 
• 75 % Brown Hair and 25% Blond Hair 
• 0% Brown Hair and 100% Blond Hair 

Multiple Choice

What belongs in the last box?

• RR

• Rr

• rr

• ff

Multiple Choice

What belongs in Box 4?

• Y

• YY

• Yy

• yy

Multiple Choice

Which of the following must be the father's genotype?

• RR

• Rr

• rr

Multiple Choice

B = brown eyes
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.

• they have same phenotype and genotype
• they have different genotypes and phenotypes
• they have same phenotype but different genotypes
• they have same genotype but different phenotypes

Multiple Choice

What ratio of the offspring from the cross shown will be homozygous recessive for the  trait of tallness? 

• 0 in 4
• 1 in 4
• 2 in 4
• 4 in 4