What are the possible combinations of alleles?

For a locus having three possible alleles, A, B, and C, there are six possible genotypes. An individual may have any of the following allele combinations: AA, AB, AC, BB, BC, CC.

Then, what is the combination of alleles?

Within an individual organism, the specific combination of alleles for a gene is known as the genotype of the organism, and (as mentioned above) the physical trait associated with that genotype is called the phenotype of the organism.

Also, what is a chart that shows possible gene combinations? Chap. 3 Genetics: The Science of Heredity

A	B
Punnett square	a chart that shows all the possible combinations of alleles that can result from a genetic cross
phenotype	an organism's physical appearance or visible traits
genotype	an organsim's genetic makeup, or allele combination
homozygous	having 2 identical alleles for a trait

Likewise, how many combinations of alleles are possible in human gametes?

There are 8,324,608 possible combinations of 23 chromosome pairs. As a result, two gametes virtually never have exactly the same combination of chromosomes. Each chromosome contains dozens to thousands of different genes.

How do you calculate gamete combinations?

If you know the haploid number for an organism, you can calculate the number of possible combinations in the gametes. The possible combinations are equal to 2ⁿ, where n is the haploid number. For the organism in Figure 9-18, n = 2, so the number of chromosome combinations is 2², or 4.

39 Related Question Answers Found

How many alleles are in a gene?

two

What are allele sizes?

Versions of a DNA sequence or a gene are called “alleles”. Because each individual has two of each type of chromosome, one inherited from each parent, everyone has two alleles at each locus. These two alleles are sometimes identical (homozygous), but usually they are not the same size (heterozygous).

How many phenotypes are there?

There are three common alleles in the ABO system. These alleles segregate and assort into six genotypes, as shown in Table 1. As Table 1 indicates, only four phenotypes result from the six possible ABO genotypes.

What are examples of phenotypes?

Phenotype Examples

Eye color.
Hair color.
Height.
Sound of your voice.
Certain types of disease.
Size of a bird's beak.
Length of a fox's tail.
Color of the stripes on a cat.

Who has stronger genes mother or father?

Paternal genes have been found to be more dominant than the maternal ones. Genes from your father are more dominant than those inherited from your mother, new research has shown.

Where are alleles located?

An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent.

Where do alleles come from?

How are new alleles created? Occasionally, DNA mutations occur in germ cells – cells destined to become eggs or sperm. In this case, the DNA mutation is copied into every new cell of the growing embryo following fertilisation. In this way, new DNA variants are passed on to the next generation.

What is a hidden trait called?

The allele that is "hidden" is the recessive allele. The phrase "dominant and recessive genes" is often used to mean "dominant and recessive alleles".

How many different combinations of gametes can be produced?

That means that one person could produce 2²³ different gametes. In addition, when you calculate the possible combinations that emerge from the pairing of an egg and a sperm, the result is (2²³)² possible combinations.

How many different combinations of human DNA are there?

The number is essentially infinite. Using an estimate of mutation frequency of around 2 x 10^-8 per base pair per replication event, we get 60 novel mutations in every living human being. There are 7 billion humans, so we know that some 420 billion different variants are possible.

How many gametes do we have?

Your body is the result of the fusion of two gametes. One from each parent. Each of those gametes had 23 chromosomes, so that after the union of those gametes, when you were just a single cell, you had 46 chromosomes. Or, 23 pairs of chromosomes.

What is the Law of Independent Assortment?

Mendel's law of independent assortment states that the alleles of two (or more) different genes get sorted into gametes independently of one another. In other words, the allele a gamete receives for one gene does not influence the allele received for another gene.

Does meiosis always produce gametes?

[Does meiosis always produce four gametes?] Nope. In some cases, meiosis does produce four functional gametes: for instance, meiosis during spermatogenesis, or sperm production, in human males yields four sperm cells.

How are genetic possibilities calculated?

To calculate the probability of getting a Bb genotype, we can draw a 4-square Punnett square using the parents' alleles for the coat color gene only, as shown above. Using the Punnett square, you can see that the probability of the Bb genotype is 1 / 2 1/2 1/2 .

How are gametes produced by meiosis?

meiosis. Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction. Meiosis I is a type of cell division unique to germ cells, while meiosis II is similar to mitosis

How are gametes produced?

Gametes are formed through meiosis (reduction division), in which a germ cell undergoes two fissions, resulting in the production of four gametes. During fertilization, male and female gametes fuse, producing a diploid (i.e., containing paired chromosomes) zygote.

Do gametes have one allele for each gene?

Each gamete of an individual carries only one allele of each gene (this is Mendel's Law of Segregation). Which gene a gamete possess is independent of other genes found on different chromosomes since homologous chromosomes align randomly during meiosis.