Vocabulary
Name the Phenotype or Genotype
Monohybrid Cross
Dihybrid Cross
More Dihybrid Cross
100

The physical appearance of an organism

phenotype

100

Assume round (R) is dominant to wrinkled (r). What is the phenotype for an organism with the genotype Rr?

round

100
How many traits are involved in a monohybrid cross?
one
100
How many traits are involved in a dihybrid cross?
2
100

How many possibilities are there for an offspring to have in a dihybrid cross? (Hint: After the Punnett square is complete?)

16

200

Segment of DNA that codes for traits

gene

200

Assume round (R) is dominant to wrinkled (r). 


Identify this genotype: rr

homozygous recessive

200
How many alleles/letters are on each genotype in monohybrid crosses?
2 (Ex: Yy, FF, mm)
200
How many alleles/letters are on each genotype in dihybrid crosses?
4 (Ex: GgIi, kkNN, HHzz)
200

Give RrTt- write all the possible gamete combinations for this parent

RT, Rt, rT, rt

300

Different versions or forms of a gene

alleles

300
__________ alleles are expressed over ___________ alleles.
Dominant, recessive
300
If dark hair (H) is dominant to blonde hair (h), what are the genotypes for the following phenotypes? 1. blonde-haired 2. heterozygous dark-haired 3. homozygous dark-haired
1. hh 2. Hh 3. HH
300

In hamsters, black fur (B) is dominant to white fur (b), and rough fur (R) is dominant to smooth fur (r). What phenotypes will be expressed by each genotype below? 1. bbRR 2. Bbrr 3. BBRr

1. white, rough fur 2. black, smooth fur 3. black, rough fur

300

If aaBb is crossed with AAbb, what proportion of the offspring will be AAbb?

0/16 or 0%

400

The genetic makeup of an organism; the allele combinations of an organism

genotype

400
What is a heterozygous genotype?
One dominant allele and one recessive allele.
400
In rabbits, the allele for black coat is dominant over the allele for brown coat color. Cross two heterozygous rabbits. What percentage of the offspring will be brown?
25%
400

In hamsters, black fur (B) is dominant to white fur (b), and rough fur (R) is dominant to smooth fur (r). What genotype(s) can a hamster have if it has black and rough fur?

BBRR or BbRr or BbRR or BBRr


400

If AaBb is crossed with aabb, what proportion of the offspring would be expected to be aabb?

4/16, 1/4, or 25%

500

A type of cross that presents the possible traits passed down to offspring for 2 traits.

a dihybrid cross

500

In rabbits, brown fur (B) is dominant to white fur and straight ears (S) are dominant to floppy ears. What genotype(s) will a rabbit have if it has white fur and straight ears?

bbSS or bbSs

500
Sickle cell is a recessive disease. Cross a carrier of the disease with a person with sickle cell anemia. What is the probability that their child will have sickle cell?
50%
500

In pigeons the checkered pattern (P) is caused by a dominant allele. A plain (non-checkered) pattern (p) is recessive. Red color (C) is also caused by a dominant allele and brown color (c) by a recessive allele. In a cross between a homozygous checkered red bird and a plain brown bird, what is the probability of producing a plain red bird?

0%

500

In pigeons the checkered pattern (P) is caused by a dominant allele. A plain (non-checkered) pattern (p) is recessive. Red color (C) is also caused by a dominant allele and brown color (c) by a recessive allele. In a cross between two heterozygous checkered and red birds, what is the probability of having offspring with both dominant traits?

9/16

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