Genetics Unit Review!

01Two white sheep produce a black offspring. What is

the dominant color?

The dominant color is White.

02What are the three

alleles for blood type?

A, B, and O

03Blood type is an example

of what type of inheritance?

Co-dominance

04What is it called when an

organism has two different alleles?

Heterozygous or

Hybrid

05What is it called when an organism has two of the

same alleles??

HomozygousHomozygousOr Or

PurebredPurebred

06In Mendel’s experiment, what happened in the F1

generation? The F2? (Give ratios)

In the F1 generation, the yellow pea disappeared.

In the F2 generation, there was a 3:1 ratio of

green:yellow(p. 237 in textbook)

07Two white sheep produce a black offspring. What

must the parents’ genotype for color be? What is the probability

that the next offspring will be black?

The parents must be Wb and Wb. There is a 25%

chance that the next offspring will be black.

08Two copies of the same

gene are known as what?

Alleles

09Sections of chromosomes

that code for our traits are called what?

Genes

10This is the genetic

material that makes up chromosomes.

DNA – Deoxyribonucleic Acid

11Albinism is caused by a

recessive gene. If normal parents have an albino

child, what is the probability that their next child will be

normal for color?

75 %

12In the babies project, why did the males flip

the coin to determine the baby’s gender?

Because in real life, the sperm (either an X or Y sperm) determines the

sex of the child.

13A black cat and a tan cat mate and form a tabby

cat. What is this an example of? Which allele

is dominant?

Incomplete dominance.

Neither allele is dominant.

14In a cross between a

black-feathered bird and a white-feathered bird, the chicks will be gray. This is

an example of…

Incomplete dominance.

Neither allele is dominant.

15Widows peak hairline in humans is dominant to non-widows peak

hairline. If a person has a widows peak hairline, which of

the following could she be?-Homozygous dominant-Homozygous recessive

-Heterozygous

She could be either homozygous dominant or

heterozygous.

16What TWO conventions (Rules or ways of writing information) do we use

for dominant traits while making a Punnett

Square?

1. The dominant trait is capitalized

2. The dominant trait is listed first

17The name for the way an

organism looks or behaves.

Phenotype

18The name for an

organism’s specific genetic make-up.

Genotype

19A yellow flower and a

blue flower exhibit incomplete dominance,

and produce green offspring. If two of these green flowers are bred, what will their offspring

look like?

25% will be blue, 25% will be yellow, and 50%

will be green

20What was Mendel’s

occupation, other than being a scientist?

He was a monk.

21What were Punnetts

years of birth and death?

1875-1967(91 years old)

22In the babies project,

name 3 dominant traits that are common in

humans.

Dimples, Freckles, Widow’s Peak, Free

Ear Lobes… etc.

23In the babies project,

which hair color consisted of 4 recessive

genes?

Pale Yellow Blonde

24What is the synonym for

Purebred?

Homozygous

25How many base pairs are in the human genome?

3 Billion!!!!