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
Aliun [14]
3 years ago
12

In Drosophila, vestigial (partially formed) wings (vg) are recessive to normal long wings (vg+) and the gene for this trait is a

utosomal. The gene for the white-eye trait is on the X chromosome. Suppose a homozygous white-eyed, long-winged female fly is crossed with a homozygous red-eyed, vestigial winged male.
a. What will be the genotypes and phenotypes of the F1 flies?
b. what will be the genotypes and phenotypes of the F2 flies?
c. what will be the genotypes and phenotypes of the offspring of a cross of the F1 flies back to each parent?
Biology
1 answer:
Marina CMI [18]3 years ago
7 0

Answer/ Explanation:

a. The genotype of a homozygous white eyed long winged female would be Vg+Vg+XrXr. We denote the white allele as recessive (r) because the XY male only has one copy and yet has red eyes, so the red eye trait (R) must be dominant. A homozygous red eyed vestigial winged male would have be VgVgXRY. The possible gametes for the female are Vg+Xr only. For the male, the possible gametes are VgXR or VgY

The attached punnett square shows the results of the cross. The females will all be Vg+VgXRXr. The males will all be Vg+VgXRY (must inherit Y from father). That means they will all  have normal length wings, the males will have white eyes and the females will have red eyes.

b. The F2 flies arise from intercrossing the F1, so the cross will be Vg+VgXRXr x Vg+VgXRY. The possible gametes for the mother are: Vg+XR, Vg+Xr, VgXR or VgXr. The possible gametes for the father are Vg+Xr

, Vg+Y

, VgXr

, VgY

. The attached punnet square shows this cross. The ratio of the phenotypes will be 6:6:2:2, or 3:3:1:1 (long-winged red eye: long-winged white eye: vestigial wing red eye: vestigial wing white eye), genotypes shown in the attachment.

c. F1 cross back to the mother would be Vg+VgXRY x Vg+Vg+XrXr. The genotypes are shown in the attached punnet square. The offspring will all be long-winged with white eyes. The F1 to the father would be Vg+VgXRXr x VgVgXRY. The ratio would be 3:3:1:1 long-winged red eye: long-winged white eye: vestigial wing red eye: vestigial wing white eye

Download docx
You might be interested in
Los aminoácidos tienen una parte variable denominada
vladimir1956 [14]

Answer: The building blocks of proteins are amino acids, which are small organic molecules that consist of carbon atoms linked to an amino group, a carboxyl group, a hydrogen atom, and a variable component called a side chain.

Translation:

Los componentes básicos de las proteínas son los aminoácidos, que son pequeñas moléculas orgánicas que consisten en átomos de carbono unidos a un grupo amino, un grupo carboxilo, un átomo de hidrógeno y un componente variable llamado cadena lateral.

7 0
3 years ago
Which is a characteristic of fast-­twitch muscle fibers?
dimulka [17.4K]

Answer:

The answer is C.

Explanation:

Due to fewer capillaries, mitochondria, myoglobin, and lower oxygen transport, type II- fast twitch muscle fibers are "fast" or quick to fatigue. With their short-term contractions, they also create greater force and strength.

3 0
2 years ago
What part of the brain is involved with short term memory
solniwko [45]
The hippocampus, which is found deep inside the medial temporal lobe
8 0
3 years ago
How many unique ip addresses could be made in a fixed length ip address system using 6 bits?
MrRissso [65]
Sixty-four (64) unique IP addresses could be made in a fixed length IP address system using 6 bits. 
The IP address is a number assigned to any item that is connected to the internet. IP stands for Internet Protocol, it's function to work over a dynamic network. It is composed of two parts, it uniquely identifies a specific interface on the network.
4 0
3 years ago
What will stop if you drink too much alcohol
adell [148]

Your liver might stop. Hope this helps

4 0
3 years ago
Read 2 more answers
Other questions:
  • In yeast, one haploid strain is unable to synthesize uracil but able to synthesize leucine, while
    15·1 answer
  • Plants that have evolved to be successful in hot, dry conditions carry out ____________ photosynthesis instead of ____________ p
    5·2 answers
  • Considered the "Command Center for the Endocrine System", the ______________ is a major link between the nervous and endocrine s
    7·1 answer
  • Plants, algae, and some bacteria use the energy of sunlight in the process of
    6·1 answer
  • A prokaryote has a Gram-negative cell wall and a basic cell membrane, is spiral shaped, and has two polar flagellA. Referring to
    10·1 answer
  • If a cell's RIBOSOMES were to stop working, what would immediately happen to the
    13·2 answers
  • What is the smallest part of an element that has the same properties of that element?
    12·1 answer
  • What is the most likely inheritance pattern for red-green
    9·1 answer
  • Where is most DNA located in a eukaryotic cell?
    13·2 answers
  • Evaluate the following claim, first from a neoclassical economist’s perspective and second from an ecological economist’s perspe
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!