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1. How many different types of F1 gametes, F2genotypes, and F2 phenotypes would be expected from thefollowing crosses?

Crosses

F1 gametes

F2genotypes

F2 phenotypes

AA x aa

AABB x aabb

AABBCC x aabbcc

General formula

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Keith Leannon
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Related questions

1. Ifa species of flower has the allele R (red) which is incompletelydominant to the allele r (white) what color is the genotype of anindividual with a red flower? Choose as many as areappropriate. (Points: 2) RR
Rr
rr
R
r

2. A gene can be defined as... (Points :2)
alternateforms of the DNA for a trait
geneticcombination that determines the observable form of a trait
partof the DNA that codes for a specific protein
theobservable form of a trait

3. A homozygote is an individual in which(Points : 2)
allelesof the gene pair are different
allelesof the gene pair are identical
genesare homolgous
traitsare passed from parents to progeny

4. Which of the following might be aphenotype? (Points : 2)
A
Aa
pinkflowers
AaDd

5. What does "F2 generation" refer to? (Points: 2)
theparents
theoffspring of the parental generation
theoffspring of crossing the F1 generation with itself
theoffspring of crossing the F1 generation with the parentalgeneration

6. Which of the following genotypes isheterozygous? (Points : 2)
Aa
AABB
A
a

7. Which statement best describes a dominantallele? (Points : 2)
theallele expressed in the homozygote
theallele expressed in the heterozygote
theallele that is most common in the population
theallele that is lethal

8. In a monohybrid cross, if genotype AA iscrossed with genotype aa what will the ratio of genotypes be?(Points : 2)
0AA:1 Aa:0 aa
1AA:2 Aa:1 aa
1AA: 1 aa
1AA:1 Aa:1 aa

9. Leaf color is controlled by 2 alleles whereA (green) is dominant to a (yellow). Leaf shape is controlled by 2alleles where B (round) is dominant to b (heart-shaped). If oneparent's genotype is AABB what is its phenotype? (Points : 2)
green,round leaves
green,heart-shaped leaves
yellow,round leaves
yellow,heart-shaped leaves

10. Leaf color is controlled by 2 alleleswhere A (green) is dominant to a (yellow). Leaf shape is controlledby 2 alleles where B (round) is dominant to b (heart-shaped). Ifthe genotype AaBb is crossed with the genotype AaBb what will theratio of phenotypes be? (Points : 3)
1green, round: 1 green, heart: 1 yellow, round: 1 yellow,heart
1green, round: 2 green , heart: 2 yellow, round: 1 yellow,heart
9green, round: 3 green, heart: 3 yellow, round: 1 yellow,heart
9AABB: 3 Aabb: 3 aaBb: 1 aabb

A pet shop is breeding neon tetra fish and find some interesting color phenotypes.

1. The breeder crosses a true-breeding red neon tetra to a true-breeding yellow neon tetra and finds that all F1 progeny are red. Crossing two F1 red neon tetras results in the following numbers of progeny: 36 Red neon tetras, 3 Yellow neon tetras, and 9 Orange neon tetras. How many genes are involved in neon tetra coloration?

a. 1

b. 2

c. 3

d. 4

e. Cannot be determined from the information given

2. Which of the following genotypes produce Red neon tetras?

a A_ B_
b. A_ bb
c. aa B_
d. aa bb
e. Both A_ B_ and aa B_ genotypes
f. Both A_ bb and aa B_ genotypes
g.

None of the above

3. If a Red F2 neon tetra is crossed to a Yellow F2 neon tetra, what is the probability that they will produce Orange offspring?

You are given 4 true-breeding mutant strains of fruit flies, each with a different eye colour
phenotype (apricot, orange, brown & scarlet). Specific reciprocal crosses between the recessive
mutant strains produced the following results in the F1 generations:
P1: apricot female x orange male F1 : apricot males and orange females
P1: orange female x apricot male F1 : orange males and females
P1: brown female x scarlet male F1 : wildtype males and females
P1: scarlet female x brown male F1 : wildtype males and females

i) Are the four mutant phenotypes all controlled by different alleles of a single gene? Explain.

ii) Which of the mutant phenotypes, if any, are due to allelic mutations?

iii) Which of the mutant phenotypes, if any, are due to alleles of autosomal genes? Explain.

iv) Using your own symbols for the mutations, indicate the genotypes of the F1 generation males
and females in each of the crosses.

v) Which of the F1 generations when intercrossed are likely to yield recombinant phenotypes in
the F2 generations? Explain showing the expected phenotypes and their proportions. (You
may assume that Mendel’s 2nd Law of Heredity holds true for the mutations involved in this
situation. Further assume that the double mutant results in a white eye color).

vi) Predict the outcome in the F1 generations of a reciprocal cross between a truebreeding strain
with brown eyes and another with apricot eyes.

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