Question

- If AaBbCcDd is mated to AaBbCcDd (no gene interactions among all genes), what is the probability that the offspring will have either the phenotype AaB_CcDD or the genotype AAbbCcD_? (assuming complete dominance for genes) (Show procedure, NO score for direct result)

- A mouse sperm of genotype a BCDE fertilizes an egg of genotype a bcDe. What are all the possibilities for the genotypes of (a) the zygote and (b) a sperm or egg of the baby mouse that develops from this fertilization? (Show procedure, NO score for direct result)

- What probability of offspring from cross (AaBbCc x AabbCc) is predicted to show the recessive phenotypes for at least two of the three traits? (assuming complete dominance for genes) (use either branched-line or Punnett square to explain; NO score for giving the direct probability)

- If the a and b loci are 30 cM apart and an AA BB individual and an aa bb individual mate: What gametes will the F1 individuals produce, and in what proportions? What phenotypic classes in what proportions are expected in the F2 generation (assuming complete dominance for both genes) (show procedure, NO score for direct result)?

- AABB and aabb individuals were crossed to each other, and the F1 generation was backcrossed to the aabb parent. 995 AaBb, 997 aabb, 3 Aabb, and 5 aaBb offspring resulted.

- How far apart are the a and b loci?
- What progeny and in what frequencies would you expect to result from testcrossing the F1 generation from a AAbb X aaBB crosss to aabb?
- In a typical meiosis, how many crossovers occur between genes A and B?
- Assume that the A and B loci are on the same chromosome, but the offspring from the testcross described above were 496 AaBb, 504 aabb, 502Aabb, and 498 aaBb. How would your answer to part (c) change.

Answer #1

We have entitled to answer only one question. So i will answer the second one (mouse problem).

Mouse sperm Mouse egg BCDE X bcDe F1 progeny -----> BbCcDDEe (Baby mouse)

a) The genotype of the Zygote is
------> **BbCcDDEe**

b) Now come to the genotype of sperm
or egg of this baby mouse. First of all we have to know that the
all cells of this baby mouse contain same genotype including germ
cell also. So the genotype og germ cells are
**BbCcDDEe.** It contain 3 different type of gene,
according to formula number of gametes produced = 2n

Where n = Different number of genes = 3 , No. of gametes produced by germs cell = 23 = 8

That means the sperm or egg contain 8 different type of genotype. The possible genotypes are given below,

1) **BCDE 2) bcDe 3) BcDE 4)
BCDe 5) bCDE 6) bcDE 7) bCDe 8) BcDe**

If AaBbCcDd is mated to AaBbCcDd (no gene interactions among
all genes), what is the probability that the offspring will have
either the phenotype aaB_CcDD or the genotype AAbbCcD_? (assuming
complete dominance for genes) (Show procedure, NO score for direct
result)

If AaBbCcDd is mated to AaBbCcDd (no gene interactions among all
genes), what is the probability that the offspring will have either
the phenotype AaB_CcDD or the genotype AAbbCcD_?

A mouse sperm of genotype a FGHY fertilizes an egg of genotype a
fghy. What are all the possibilities for the genotypes of (a) the
zygote and (b) a sperm or egg of the baby mouse that develops from
this fertilization? (Show procedure, NO score for direct
result)

What probability of offspring from cross (AaBbcc x AabbCc) is
predicted to show the recessive phenotypes for at least one of the
three traits? (assuming complete dominance for genes) (use either
branched-line or Punnett square to explain)

For problem 1, to compute probabilities, the probability of
event 1 AND event 2 is obtained by multiplying the two
probabilities together, whereas the probability of event 1 OR event
2 is obtained by adding the two probabilities. 1. Duchenne muscular
dystrophy (DMD) is a condition that causes muscle degeneration and
then death. Most people with the condition are wheelchair-bound by
age 12 and dead before age 30. The condition is due to a mutation
in the gene for a...

1.Which of the following is TRUE?
a) Genetics is about the genotype.
b)Inheritance is controlled by factors and each offspring
receives three factors from each parent.
c)Allele pairs never segregate from one another.
d)The principle of segregation states that genes for different
traits assort independently of one another in the formation of
gametes.
e)Independent assortment of two traits shows a F2 generation
that has a 9:3:3:1 phenotypic ratio.
2.A cross between a black rabbit (BB) and a white rabbit (bb)...

For
problem 1, to compute
probabilities, the
probability of event 1 AND event 2 is obtained by multiplying the
two probabilities together, whereas the probability of event 1 OR
event 2 is obtained by adding the two
probabilities.
1.Duchenne muscular
dystrophy (DMD) is a
condition that causes muscle degeneration and then
death. Most people with
the condition are wheelchair-bound by
age 12 and dead before
age 30.
The condition is due to
a mutation in the gene for a
protein,...

For problem 1, to compute probabilities, the probability of
event 1 AND event 2 is obtained by multiplying the two
probabilities together, whereas the probability of event 1 OR event
2 is obtained by adding the two probabilities.
1. Duchenne muscular
dystrophy (DMD) is a condition that causes muscle degeneration and
then death. Most people with the condition are wheelchair-bound by
age 12 and dead before age 30.
The condition
is due to a mutation in the gene for...

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