Genetics Test Review

Key Terms

100

The mating of two organisms.

A) Brood

B) Cell Division

C) Cross

D) Dihybrid

C) Cross

200

Alternate version of a gene. 

A) Trait

B) Allele

C) Homozygote

D) Gamete

B) Allele

300

A segment of DNA that provides instructions for making protein. 

A) Gene

B) Trait

C) Allele

D) Chromosome

A) Gene

400

The physical expression of an organism's genes. 

A) Karyotype

B) Genotype

C) Genome

D) Phenotype

D) Phenotype

500

A ____  mutation occurs when one nucleotide is SWAPPED with another nucleotide. Example: ATGC --> AAGC

a) deletion

b) frameshift

c) point

d) gene translocation

c) point

Punnett Squares

100

What percentage of offspring will show the dominant phenotype?

100% 

200

This cross shows a heterozygote being crossed with a _______ individual.  

a) Homozygous recessive

b) Homozygous dominant 

c) Heterozygous

a) Homozygous recessive

300

Brown eyes is dominant to blue eyes. Cross a blue eyed person with a homozygous dominant individual. List ALL possible genotypes. 

100% Bb

400

What is the genotypic ratio of the offpsring? 

1:2:1

500

If Mom's genotype is AaBb, what would you write across the top of a Punnett square? 

AB / Ab / aB / ab

Complex Inheritance

100

In carnations, red and white are both dominant. The flower shown here has the genotype RW, and exhibits both dominant traits  equally. This is an example of ____.a) Codominance

b) Incomplete dominance

c) X-linked inheritance

d) Complete dominance

a) Codominance

200

In mice, black fur (BB) and white fur (WW) are both dominant. A mouse with the genotype BW will have grey fur. This is an example of: 

a) Codominance

b) Incomplete dominance

c) X-linked inheritance

d) Complete dominance 

b) Incomplete dominance

300

Sarah has a blood type of I^A i and her husband has a blood type of I^B i. Their child has blood type I^A I^B. This is an example of: 

a) Codominance

b) Incomplete dominance

c) X-linked inheritance

d) Complete dominance

a) Codominance

400

Human skin color is determined by over 150 different genes. Skin color is an example of ___. 

a) Polygenic Inheritance

b) Codominance

c) Mendelian Inheritance

d) Incomplete Dominance

a) Polygenic Inheritance

500

The allele for color blindness is recessive and located on the X chromosome (X^b). What would be the genotype of a non-colorblind female who has a son with colorblindness? 

X^B X^b

Surprise!

100

In a family, the two parents have blood groups of A and B and the three children have blood groups of B, B and O. What are the genotypes of the parents?

A] I ^A I ^A and I ^B I ^B   B] I ^A I ^B and I ^A I O

C] I ^A I ^O and I ^B I ^{O      D]}  I ^B I ^O and I ^B I ^A

C 

[FROM 2024 PAST PAPER]

200

Which statement describes a type of variation? 

A]Continuous variation is usually caused by the environment only. 

B Continuous variation results in a limited range of phenotypes with no intermediates. 

C Discontinuous variation is usually caused by genes only. 

D Discontinuous variation results in a range of phenotypes between two extremes. 

C

[2024 PAST PR]

300

Which statement about variation is correct? 

A] ABO blood groups show continuous variation.          B] Body mass shows discontinuous variation.             C ] Seed colour in peas shows continuous variation.   D] Seed shape in peas shows discontinuous variation.

D

[PP]

400

Which statement is true of both chromosomes and genes? 

A Each codes for a specific protein. 

B Each may be copied and passed on in mitosis. 

C Each may be either dominant or recessive. 

D Each may exist as two or more alleles.

B

500

In some animals, B is the allele for normal skin (without spots) and b is the allele for spotted skin. A pair of these animals has 37 offspring, 18 with spots and 19 without. What are the most likely genotypes of the parents? 

A] BB × BB           B] Bb × Bb 

C ]Bb × bb            D] bb × bb

C