1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
cluponka [151]
2 years ago
8

In Drosophila, the genes for body coloration and eye size are on different chromosomes. Normal-colored bodies are dominant to eb

ony-colored (very dark) bodies, and normal-sized eyes are dominant to being eyeless. Line A is true breeding for normal body and normal eye, whereas line B is true breeding for ebony bodies and eyeless. Individuals from lines A and B are crossed. From a dihybrid cross between the F1 generation, 400 flies are scored. How many of these F2 flies are expected to have both normal body color and normal eyes?​
Biology
1 answer:
Yuri [45]2 years ago
7 0

Answer:

225 flies

Explanation:

Let gene for body colour : A

Let gene for eye type : B

Parent 1 : normal body and normal eyes = AABB

Parent 2: ebony body and eyeless = aabb

F1 : AABB X aabb = AaBb ( all have normal body and normal eye )

F1 progeny is self crossed given that the two genes are on different chromosomes which means they show independent assortment:

AaBb X AaBb =

A_B_ = normal body, normal eyes = 9

aaB_ = ebony body, normal eyes = 3

A_bb = normal body, eyeless  = 3    

aabb = ebony body, eyeless  =   1

Hence the ratio is 9 : 3 : 3 : 1

Out of the 400 flies:

(9/16) * 400 = 225 flies have normal body colour and normal eyes

You might be interested in
Li-Fraumeni syndrome (LFS1) is a rare hereditary disorder that leads to a predisposition to cancer. This hereditary disorder is
Nimfa-mama [501]

Answer:

CHK2, p53, p21, cell cycle progression.

Explanation:

In a normal cell with no LFS mutation, during the G1 stage of cell cycle progression, the CHK2 activates if there is damage in the DNA. CHK2 activates p53, which is a tumor suppressor protein that will hold the cell cycle in G1/S until the DNA is repaired. The p53 protein activates p21, a protein that binds to CDK2 and stops the cell cycle. The cell cycle will continue once the damage is repaired.      

3 0
3 years ago
*
snow_tiger [21]
C.2
.........................
5 0
2 years ago
List and describe the functions of the three types of blood vessels in the circulatory system
baherus [9]
<span>There are three major types of blood vessels: the arteries, which carry the blood away from the heart; the capillaries, which enable the actual exchange of water and chemicals between the blood and the tissues; and the veins, which carry blood from the capillaries back toward the heart</span>
6 0
3 years ago
The two chickens below are bred together. Which of the following is a possible set of offspring for these parents?One red chicke
GalinKa [24]

The provided question is incomplete as the cross in between parents, however the cross between in red and white bred parents.

Answer:

The correct answer is : five red/white chickens.

Explanation:

Parents should be homozygous for feather color, each offspring will inherit F from one of the parent, and the f allele from parent 2. So, every offspring will have the genotype F and f and will have white and red fathers.

Thus, the correct answer is : five red/white chickens.

7 0
2 years ago
Explain the most common machine in the human body
Ilya [14]
HI there!!!!!!

It would probably be the heart, brain or our muscles; they are constantly working !

5 0
2 years ago
Other questions:
  • 4. An animal that relies on a digestive tract for digestion breaks down food bya. both intracellular and extracellular digestion
    8·1 answer
  • If an animal leaves a footprint in soft mud, what type of fossil may be made?
    12·2 answers
  • What are the similarities between photosynthesis and aerobic and anaerobic respiration?
    11·1 answer
  • How did you create a silent mutation? Explain, giving the code for the triplet where you made your substitution, before and afte
    9·1 answer
  • A researcher is concerned about a population of Bavarian pine voles, a type of endangered rodent. The researcher wants to estima
    5·2 answers
  • Veins carry blood ________ the heart.
    13·1 answer
  • Which of the following
    10·1 answer
  • Which of the following correctly describes binomial nomenclature?
    5·1 answer
  • All blood vessels containing oxygenated blood are colored red EXCEPT for ?
    15·2 answers
  • Can one model demonstrate all outcomes of mitosis?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!