How Many Different Genotypes Are Possible

How Many Different Genotypes Are Possible?

Genotype is also used to refer to the pair of alleles present at a single locus. With alleles ‘A’ and ‘a’ there are three possible genotypes AA Aa and aa. With three alleles 1 2 3 there are six possible genotypes: 11 12 13 22 23 33. First we must appreciate that genes do not act in isolation.

How do you determine the number of possible genotypes?

Number of genotypes for a given number of alleles Given n alleles at a locus the number genotypes possible is the sum of the integers between 1 and n: With 2 alleles the number of genotypes is 1 + 2 = 3. 3 alleles there are 1 + 2 + 3 = 6 genotypes.

How many different genotypes are possible from the cross?

Three different genotypes are possible to form a cross between the parents RR and rr. This cross between RR and rr is defined as a monohybrid cross. The heterozygous F1 offspring produces two types of gametes which after selfing produce offspring which have a genotypic ratio of 1:2:1.

Can there be 4 genotypes?

Things get slightly more complex when considering two genes. For instance a wild-type fly (with red eyes and a yellow body) has one of four possible genotypes: EEBB EEBb EeBB and EeBb.

How many phenotypes are possible?

A fetus receives one of these three alleles from each of its parents. This produces four possible phenotypes (blood types) and six possible genotypes.

How many genotypes are possible with N alleles?

The number of different genotypes is 3 n where n = number of genes. For simple dominant–recessive relations the number of different phenotypes is 2 n where n = number of genes.

How many different genotypes are possible from a cross between the parents RrYy and RrYy?


F2 generation- Self cross is done between RrYy. The number of RrYy heterozygous hybrids obtained are 4. Thus the correct answer is option ‘A’.

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What are the differences between genotypes and phenotypes?

The genotype is a set of genes in the DNA which are responsible for the unique trait or characteristics. Whereas the phenotype is the physical appearance or characteristic of the organism. Thus we can find the human genetic code with the help of their genotype.

What is the genotype of the male female?

Most people have either two X chromosomes (genotypic female) or an X and a Y chromosome (genotypic male). Phenotypic sex refers to an individual’s sex as determined by their internal and external genitalia expression of secondary sex characteristics and behavior.

Can AA and SS marry?

AC is rare whereas AS and AC are abnormal. Compatible genotypes for marriage are: AA marries an AA. … And definitely SS and SS must not marry since there’s absolutely no chance of escaping having a child with the sickle cell disease.

What is the sickness of AA genotype?

Children with genotype AA (92.3%) were more susceptible to malaria parasite than AS (5.1%) and SS (2.6%). The association of haemoglobin genotype with malaria was highly significant (p<0.001).

What does AA genotype mean?

So an individual with the AA genotype is “homozygous” (both alleles the same) for the dominant version of the gene. An “Aa” individual is “heterozygous (two different alleles) and “aa” is homozygous for the recessive allele.

How many possible genotypes are there for ABO blood group?

The ABO blood group antigens are encoded by one genetic locus the ABO locus which has three alternative (allelic) forms—A B and O. A child receives one of the three alleles from each parent giving rise to six possible genotypes and four possible blood types (phenotypes).

How many phenotypes and genotypes are possible in f2 generation?

Phenotypes-4 Genotypes-9.

How many phenotypes are possible in a Trihybrid cross?

27 different genotypes

There are 27 different genotypes possible in trihybrid cross hence its genotypic ratio is not mentioned.

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How many genotypes has 6 alleles?

Consider the case though of a locus with 6 alleles. It has 21 possible genotypes — 6 kinds of homozygotes and 15 kinds of heterozygotes. Writing it out 6 + 5 + 4 + 3 + 2 + 1 = 21 = [6*(6+1)]/2 — this is the formula for combinations of six things taken two at a time order unimportant — [n(n+1)] / 2.

How many genotypes are possible with 5 genes?

The formula that predicts the number of genotypes from the number of genes is 3 to the power n.
# of Genes # of Genotypes
1 3
2 9
5 243
10 59 049

How many genotypes are in a diploid?

In a diploid organism one that has two copies of each chromosome two alleles make up the individual’s genotype.

How many kinds of genotypes will the offspring?

Genotype is also used to refer to the pair of alleles present at a single locus. With alleles ‘A’ and ‘a’ there are three possible genotypes AA Aa and aa. With three alleles 1 2 3 there are six possible genotypes: 11 12 13 22 23 33.

How many kinds of genotypes are observed in F2 generation of a Dihybrid cross?

9 different genotypes

Hence 9 different genotypes are possible in Mendel dihybrid cross and the correct option is (B).

What is the genotype ratio of Dihybrid cross?

Question : Genotypic ratio of a dihybrid cross is
Question Genotypic ratio of a dihybrid cross is
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What are the different genotypes?

A description of the pair of alleles in our DNA is called the genotype. Since there are three different alleles there are a total of six different genotypes at the human ABO genetic locus. The different possible genotypes are AA AO BB BO AB and OO.

What are 2 examples of genotypes?

Other examples of genotype include: Hair color. Height. Shoe size.

Genotype examples
  • A gene encodes eye color.
  • In this example the allele is either brown or blue with one inherited from the mother and the other inherited from the father.
  • The brown allele is dominant (B) and the blue allele is recessive (b).

What are the three types of genotypes in humans?

There are three types of genotypes: homozygous dominant homozygous recessive and hetrozygous.

What is the gender of YY?

Males with XYY syndrome have 47 chromosomes because of the extra Y chromosome. This condition is also sometimes called Jacob’s syndrome XYY karyotype or YY syndrome. According to the National Institutes of Health XYY syndrome occurs in 1 out of every 1 000 boys.

Does XY mean female?

Typically biologically male individuals have one X and one Y chromosome (XY) while those who are biologically female have two X chromosomes. However there are exceptions to this rule. The sex chromosomes determine the sex of offspring.

What is the genotype of a colorblind woman?

Problem 1: Audrei’s genotype
Female Genotype Female Phenotype
XR XR Normal Vision
XR Xr Normal vision “carrier”
Xr Xr Red-green color blind

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Is CC genotype A Sickler?

Hemoglobin C disease is not a form of sickle cell disease. People who have hemoglobin C disease have red blood cells that contain mostly hemoglobin C. Too much hemoglobin C can reduce the number and size of red blood cells in your body causing mild anemia.

Which blood groups should not marry?

There is no combination of blood groups who cant marry each other. We are to healthy and we are also older than 18 years. The couple who got married in 2016 battled childlessness which mounted a … Could O+boy marry O+girl?

Does as genotype fall sick?

Sickle cell trait (AS) usually does not cause any health problems.

Can a genotype change?

Genotype generally remains constant from one environment to another although occasional spontaneous mutations may occur which cause it to change. However when the same genotype is subjected to different environments it can produce a wide range of phenotypes.

What genotype can marry each other?

GENOTYPE COMPATIBILITY Two partners genotype are said to be compatible when they have no possibility of birthing a child with sickle cell disease. They are said to be incompatible when they can possibly have a child with sickle cell disease. Genotype AA is the universally compatible genotype.

What food is good for genotype AA?

What to eat on the A-positive blood type diet
  • soy protein such as tofu.
  • certain grains such as spelt hulled barley and sprouted bread.
  • walnuts pumpkin seeds and peanuts.
  • olive oil.
  • certain fruits such as blueberries and elderberries.
  • certain kinds of beans and legumes.

Can O+ have a baby with O?

That means each child of these parents has a 1 in 8 chance to have a baby with an O- blood type. Each of their kids will also have a 3 in 8 chance of having A+ a 3 in 8 chance of being O+ and a 1 in 8 chance for being A-. An A+ parent and an O+ parent can definitely have an O- child.

How many possible phenotypes and genotypes given a cross?

How many different possible gametes are produced by the diploid genotype AaBbCCdd? Simple Formula

How many different genotypes are possible form a cross between the parents RR and rr?

List all the genotypes possible

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