Question

1.Which of the following is TRUE? a) Genetics is about the genotype. b)Inheritance is controlled by...

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) produces offspring with a mix of black and white fur. This is an example of

a)Incomplete dominance.

b)Codominance.

c)Polygenic inheritance.

d)Multiple alleles.

e)Nondominance.

3.How will “AaBb” align along the metaphase plate during meiosis I (assuming independent assortment)?

a)AA

aa

BB

bb

b)Aa

Bb

c)AA aa

BB bb

d)AA aa

bb BB

e) Both 3rd and 4th answer choice.

4. In a cross between AaBbCc and AabbCC, what is the probability of an offspring with the phenotype Dominant A, Dominant B, and Dominant C?

a)1/2

b)1

c)3/8

d)3/16

e)1/12

5.A red-eyed female Drosophila whose mother was white-eyed, is crossed with a red-eyed male. What is the phenotype of the offspring?

a)All white-eyed.

b)All red-eyed.

c)¾ red-eyed and ¼ white-eyed.

d)¾ white-eyed and ¼ red-eyed.

e)½ red-eyed and ½ white-eyed.

6.Which of the following is TRUE regarding McClintock’s and Creighton’s experiment with corn?

a)They used a pair of homologous chromosomes that were physically identical.

b)They showed that chromosomes do not physically exchange chromosomal material.

c)The experiment could only be verified cytologically, not phenotypically.

d)Only recombinant phenotypes appeared.

e)The recessive phenotype could only appear as a result of crossing over.

7.Which of the following is TRUE?

a)Linkage is 0% to 50%.

b)Genes that are far apart on the same chromosome are less likely to crossover.

c)One map unit = 100 cM.

d)For mapping, traits must be within 50% in theory.

e)Two traits 100% apart would end up together 0% of the time.

8.You cross a Drosophila AaBbCc (parents were AABBCC x aabbcc) with another Drosophilaaabbcc. You get the following phenotypes. Which gene is in the middle?

1000 offspring:

  • 675 dominant ABC or recessive abc phenotypes
  • 25 aBc or AbC
  • 75 Abc or aBC
  • 225 ABc or abC

a)A

b)B

c)C

9)A recombination frequency of 28% between two D. melanogaster genes suggests which of the following regarding their relative chromosomal locations?

a)They are located on two different chromosomes.

b)They are on the same chromosome, but not linked.

c)They are linked on the same chromosome.

d)They assort independently.

Recombination frequency does not provide information with respect to chromosome location.

Homework Answers

Answer #1

1 e)Independent assortment of two traits shows an F2 generation that has a 9:3:3:1 phenotypic ratio.

2a. Incomplete dominance-

Incomplete dominance is when a dominant allele, or form of a gene, does not completely mask the effects of a recessive allele, and the organism's resulting physical appearance shows a blending of both alleles.

3.

4c. 3/8

. AaBbCc and AabbCC

Aa x Aa-

A a
A AA Aa
a aA aa

3/4 probability of being dominant

Bb x bb

B b
b Bb bb
b Bb bb

1/2 probability of being dominant

Cc x CC

C c
C CC Cc
C CC Cc

probability of being dominant - 1

Thus the overall probability of being dominnat= 3/4 x 1/2 x 1 =3/8

5.c)¾ red-eyed and ¼ white-eyed.

XEX x XEY

Red eyed female x red-eyed male

XE X
XE

XEXE

RED EYED FEMALE

XEX

RED EYED FEMALE

Y

XEY

RED EYED MALE

XY

WHITE EYED MALE

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
In a cross between a white-eyed female with two X chromosomes and one Y chromosome (XwXwY)...
In a cross between a white-eyed female with two X chromosomes and one Y chromosome (XwXwY) with a red-eyed male, the majority of the males have white eyes and the majority of the females have red eyes. However, rare red-eyed males and white-eyed females are present as well. What is the most likely chromosomal constitution of the red-eyed males and white-eyed females resulting from this cross? Notes: Xw is recessive (white) and X+ is dominant (red). The answer is not...
A cross between population 1 and 2 results in the following distribution of phenotypes: White eyed,...
A cross between population 1 and 2 results in the following distribution of phenotypes: White eyed, long wings: 46.5% Red eyed, short wings: 46.5% White eyed, short wings: 3.5% Red eyed, long wings: 3.5%                                       7% of the time there is a crossing over event A cross between population 1 and 3 results in the following distribution of phenotypes: White eyed, thin antennae: 47.5% Red eyed, club antennae: 47.5% White eyed, club antennae: 2.5% Red eyed, thin antennae: 2.5% A cross between...
A and B genes are linked at 20 cM apart. A genotype with known linkage phase...
A and B genes are linked at 20 cM apart. A genotype with known linkage phase AB/ab is testcrossed to aa bb. What proportion of the offspring is expected to be dominant for both genes? Select one: A. 80% B. 40% C. 10% D. 20% E. 0%
1. A species has a diploid chromosome number of 10. In cells undergoing meiosis the number...
1. A species has a diploid chromosome number of 10. In cells undergoing meiosis the number of chromosomes present in one of the two cells produced after the first division of meiosis is a) 5 b) 10 c) 15 d) 20 d) 40. 2.You cross an Aa Bb Cc individual with an individual of genotype Aa Bb cc: The expected proportion of offspring of genotype Aa BB cc is a) 1/2 b) 1/4 c) 1/8 d) 1/16 e) 1/32. 3.In...
QUESTION 17 For each phrase on the left, choose the best matching term on the right...
QUESTION 17 For each phrase on the left, choose the best matching term on the right Offspring of the parental generation the alleles an individual has the relative chromosomal location of a gene pairing of homologous chromosomes haploid cells specialized for reproduction observable characteristic alternate forms of a gene array of chromosomes in a given cell chromosomes that do not differ between the sexes cross of an individual with ambiguous genotype with a homozygous recessive alleles of one gene separate...
Tallness (T ) in snapdragons is dominant to dwarfism (t ), while red (R ) flower...
Tallness (T ) in snapdragons is dominant to dwarfism (t ), while red (R ) flower color is incompletely dominant to white (R' ). The heterozygous condition results in pink (RR' ) flower color. The genes for these traits occur on separate chromosomes. A dwarf, red snapdragon is crossed with a plant homozygous for tallness and white fowers. a) Determine the genotypes of the parents. b) Determine all the types of gametes each parent can produce. c) Complete the Punnett...
What is true about incomplete dominance? A. Genotype can be determined directly from phenotype B. One...
What is true about incomplete dominance? A. Genotype can be determined directly from phenotype B. One gene affects the expression of another C. All progeny of a given cross are heterozygotes D. Two genes do not assort independently E. Progeny never have the same phenotype as either parent Also please explain why the other answers are incorrect, thanks.
If AaBbCcDd is mated to AaBbCcDd (no gene interactions among all genes), what is the probability...
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...
Question 61 pts __________ is a homozygous recessive genotype. BB Bb bb blue Flag this Question...
Question 61 pts __________ is a homozygous recessive genotype. BB Bb bb blue Flag this Question Question 71 pts If both parents are heterozygotes (Bb), what is the probability that their offspring will have a brown phenotype or have brown eyes? 25% 50% 75% 100% Flag this Question Question 81 pts If both parents are heterozygotes (Bb), what is the probability that their offspring will have a heterozygous genotype? 25% 50% 75% 100% Flag this Question Question 91 pts If...
Cross Category 2: P1 - virgin white-eyed females x P2 - sepia-eyed males A) Are the...
Cross Category 2: P1 - virgin white-eyed females x P2 - sepia-eyed males A) Are the genes for white eyes and sepia eyes dominant or recessive? B) Give the genotypes of P1 white-eyed females and P2 sepia-eyed males. Note: remember that two different genes are responsible for the white and sepia phenotypes. C)Based on your answer to the previous question, please provide the expected phenotype and genotype of the F1 flies. Show your work. 16 D)What are the expected F2...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT