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3 years ago

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

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In a maternity ward, four babies become accidentally mixed up. The ABO blood types of the four babies are known to be. Baby Jane

nydimaria [60]

Answer:

See explanation

Explanation:

We inherit our blood groups from both parents. Our blood type is controlled by a single gene. This gene displays 3 different allelic pairs which must include A, B or O. A child is expected to receive one of the three possible allelic pairs from each of the both parents. This means that there are six possible genotype and four possible phenotype for the child.

Given that Christopher's parents (Andersons) are AB and O,Christopher can have a B blood group.

Given that John's parents (Browns) are A and O, it explains how John can have blood group A.

Given that The Christiansons are A and AB, they can give birth to Robin whose blood group is AB.

Since the Dietrichs are O and O, the only possible blood group of their child is O, hence they are definitely the parents of Jane.

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2 years ago

Why are enzymes known as biocatalysts?

Vikentia [17]

Enzymes act as catalysts that remain unmodified as they increase the rate of a chemical reaction.

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2 years ago

Read 2 more answers

Genetics is the study of ________.

butalik [34]

Answer:

Option-B

Explanation:

Heredity refers to the passing of the traits from the parents to the offsprings or generation and also known as inheritance and Genetic variation is the difference in the genetic material in population which leads to the formation of a variety of traits.

Since the variation in traits is determined by factors (Gregor Mendel) later called "genes" which are passed on to the offsprings, therefore, the branch of biology which studies the pattern of inheritance and variation is known as "Genetics". Gregor Mendel is known as the Father of Genetics.

Thus, Option-B is the correct answer.

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2 years ago

A nurse recalls that the blockage of dopamine by antipsychotic drugs can cause extrapyramidal side effects such as akathisia. wh

Karo-lina-s [1.5K]

<span>Akathisia is the inability to sit still. People will tend to be uneasy and want to be doing something. They'll be fidgety, looking for something to do with their hands, or be looking to get up and walk around.</span>

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2 years ago

Your New Year's resolution is to drastically reduce the amount of cholesterol in your diet by eating less meat and more fruits a

grin007 [14]

After a few months of eating less meat and more fruits and vegetable, the liver will respond by producing more cholesterol.

<h3>What is body homeostasis?</h3>

The term body homeostasis makes reference to the internal equilibrium (homeostasis) of the body.

Body homeostasis may involve the production of certain substances when they are not consumed from the diet.

In this case, it is possible to increase cholesterol levels by having certain healthy habits (food habits).

Learn more about body homeostasis here:

brainly.com/question/13349261

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2 years ago