Genetics

Vocabulary

100

Define phenotype.

An organism's physical appearance or visible traits that are expressed

200

Define genotype.

The gene combination for a trait. Written using capital and lower case letters.

300

Write a homozygous recessive and homozygous dominate genotype.

aa - homozygous recessive

AA - homozygous dominate 

400

A diagram used to show the genetic possibility of offspring is called a __________________.

Punnett Square

500

What is an allele? What two forms can it take?

Gene for a specific trait. Can be dominate or recessive.

Monohybrid Cross

100

Write a heterozygous genotype.

Aa

200

The passing of traits from parent to offspring is called ____________.

heredity

300

B = Brown 

b= Blue

Cross the following parents to show the offspring. 

                               BB x bb

All genotypes = Bb 

400

B = Brown eyes 

b = blue eyes

Cross a heterozygous father and a mother with blue eyes. Show all work. 

Bb x bb 

Results:

Bb = 2/4 50%

bb = 2/4 50%

500

B = Brown eyes

b = blue eyes

Cross two heterozygous parents. Write the possible genotypes and phenotypes. 

Bb x Bb     75% brown eyes 25% blue eyes

50%  2/4 Bb 

25% 1/4 BB

25% 1/4 bb

Genetics

100

Who is known as the father of genetics?

Gregor Mendel

200

In a heterozygous genotype, which allele is expressed?

dominate

300

When is a recessive allele expressed?

In the absence of a dominate allele

400

Describe the genotype "RR" in two different ways.

Pure dominate 

Homozygous dominate 

500

R = round

r = wrinkled

A pure recessive and pure dominant pea plant are crossed. Write the possible genotypic and phenotypic possibilities. 

RR x rr

Rr 100%

100% Round 

Incomplete Dominance

100

Describe incomplete dominance?

The offspring recessives a blended trait from its parents.

200

One purebred black dog (BB) is bred with a purebred white dog (bb).  The cross is co-dominant.  What will the babies look like? (Bb) 

black and white fur 

300

A red flower (RR) and a white flower (rr) are crossed.  What will the offspring look like if the cross is incomplete dominance?

Pink

400

Describe incomplete dominance. 

When heterozygous offspring get a blended trait of the parents.

500

1. In radishes, red (R) and white (W) are pure-breeding colors, while hybrids are purple (RW).  If a red radish is crossed with a white radish, what will be the phenotype of the offspring? Show the Punnett Square and percentage of each phenotype.

RW - 100% purple

Codominance

100

Describe codominance.

When both dominant alleles from a gene are expressed

200

One purebred black dog (BB) is bred with a purebred white dog (bb).  The cross is co-dominant.  What will the babies look like? (Bb)

both white and black

300

Which of the blood types is codominant? 

Blood Type AB

400

Blood type AB is crossed with a parent with Blood Type BO. What are the possible blood types of the offspring. 

AB 

BB

AO

BO

500

A man with type O blood has a child with a woman who has Type AB blood . What are the possible blood types of the children. Show the Punnett Square work and the percentages.

Blood Type A

Blood Type B