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
sergejj [24]
3 years ago
12

Why do multiple and lethal alleles often result in modifications of the classic Mendelian monohybrid and dihybrid ratios?

Biology
1 answer:
allochka39001 [22]3 years ago
3 0

Answer:

Multiple alleles can modify the classical Mendelian ratio by increasing the number of phenotypes.  

For example, in a monohybrid cross, Mendel gets only 2 phenotypes however, in ABO blood groups (a classical example of multiple alleles) there are four phenotypes present in a population.

Lethal alleles are the alleles which when expressed result in the death of an organism. These alleles can be dominant, recessive or conditional (depends on interaction with another gene).  

Thus, lethal allele reduces the ratio of the phenotype associated with it by affecting the survival of the organism.

For example, lethal yellow allele in mice results changes the phenotype ratio from 3:1 to 2:1

You might be interested in
Bodo
Arlecino [84]

Answer:

Saliva lubricates and moistens these food particles

Explanation:

As teeth help to break down large pieces of food into lots of smaller pieces, saliva is released and mixes with the smaller food pieces. Saliva lubricates and moistens these food particles such that a ball-like mixture of food and saliva that is known as a bolus is formed, which can then be easily swallowed.

7 0
2 years ago
In photosynthesis what substances come in from the outside
Akimi4 [234]
<span>Sunlight CO2 and Water

</span>
5 0
3 years ago
Which of the following describes the correct stepwise assembly (in vitro) of the eukaryotic RNA polymerase II preinitiation comp
PilotLPTM [1.2K]

Answer: (TFIID) TBP-> TFIIB IIA--> TFIIF RNA POL II

Explanation:

Remember that in eukaryotic organisms, transcription and processing are coupled processes. There are 3 different types of Rna pol. In the case of RNA pol II transcribes genes that encode proteins (mRNA synthesis). Transcription factors are involved, for example: TFIID, TBPs, TAF (recognizes TATA promoter center, regulatory functions), TFIIA (stabilizes TBP union, antirepressant function), TFIIB (RNA Pol II starting point selection).

7 0
3 years ago
The Cretaceous-Tertiary extinction, the most famous of the Big Five, has been attributed to what major event(s) that triggered t
polet [3.4K]

This question has a two part answer. The first part is that an asteroid hitting the earth and the second part is massive volcanoes erupting around the world.

5 0
3 years ago
Read 2 more answers
Why is the horseshoe crab an example of a living fossil
Molodets [167]

Hey there! Here is your answer: Horseshoe crab is considered living fossils because they have existed unchanged for about 445 million years. They are usually not crab; they are not closely related to lobsters or crab. ... Horseshoe crab looks is almost the same with their ancient relatives despite the fact that they have been around for so long. I hope this helped! Your fellow Brainly user, GalaxyGamingKitty. (THE FOLLOWING INFORMATION HAS BEEN USED FROM GOOGLE)

8 0
3 years ago
Read 2 more answers
Other questions:
  • Reproductive isolation is _____.
    12·1 answer
  • An example of a biological event that follows a circadian rhythm is: the migration of birds. The female menstrual cycle. Body te
    15·1 answer
  • The first earthling to orbit our planet was just two years old. Her name was Laika, and she was picked up in the streets of Mosc
    15·1 answer
  • Which of the following molecules is/are most likely to have selective proteins in the BBB to facilitate its passage into the bra
    10·2 answers
  • What is the use of the kidneys​
    14·1 answer
  • Which of these treats malaria?
    14·1 answer
  • Why is water harder in certain regions of the world than in others?
    5·2 answers
  • The stars appear to move across the sky every day, but
    15·1 answer
  • How are fossils different from animals living today? Why do you think there are such differences?​
    5·1 answer
  • How does low temperature affect enzyme activity?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!