An organism that is
homozygous
for a specific trait carries two identical alleles at a particular genetic locus.
What is the name of an organism that has two identical alleles?
Genotypes are described as
homozygous
if there are two identical alleles at a particular locus and as heterozygous if the two alleles differ. Alleles contribute to the organism's phenotype, which is the outward appearance of the organism.
What term would best be used to describe an organism possessing two identical genes for a trait?
An organism in which the two copies of the gene are identical — that is, have the same allele — is called
homozygous
for that gene. An organism which has two different alleles of the gene is called heterozygous.
What is the production of organisms with identical genes called?
Homozygote
, an organism with identical pairs of genes (or alleles) for a specific trait.
What is homozygous and heterozygous?
Homozygous:
You inherit the same version of the gene from each parent
, so you have two matching genes. Heterozygous: You inherit a different version of a gene from each parent. They do not match.
When two or more genes affect a single character it is called?
7. When two or more genes affect a single character, it is called
cross-fertilization
.
Are alleles DNA?
Except in some viruses, genes are made up of DNA, a complex molecule that codes genetic information for the transmission of inherited traits. Alleles are also genetic sequences, and they too code for the transmission of traits. … The short answer is that
an allele is a variant form of a gene
.
What is allele example?
Different versions of a gene are called alleles. … For example, the
allele for brown eyes is dominant
, therefore you only need one copy of the ‘brown eye' allele to have brown eyes (although, with two copies you will still have brown eyes).
Who is known as the father of genetics?
Gregor Mendel
. Gregor Mendel's work in pea led to our understanding of the foundational principles of inheritance. The Father of Genetics. Like many great artists, the work of Gregor Mendel was not appreciated until after his death.
What is the recessive allele?
Recessive refers to a type of
allele which will not be manifested in an individual
unless both of the individual's copies of that gene have that particular genotype.
What traits are inherited?
- Eye Colour. Dominant and recessive genes play a role in determining eye colour of the child. …
- Height. If the father is tall, there is more chance for the child to also be tall. …
- Dimples. …
- Fingerprints. …
- Lips. …
- Sneezing. …
- Teeth structure. …
- Mental disorders.
What is a coiled strand of DNA called?
In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called
chromosomes
. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure. … DNA and histone proteins are packaged into structures called chromosomes.
How many genes do humans have?
An international research effort called the Human Genome Project, which worked to determine the sequence of the human genome and identify the genes that it contains, estimated that humans have
between 20,000 and 25,000 genes
. Every person has two copies of each gene, one inherited from each parent.
What is an example of heterozygous?
If the two versions are different, you have a heterozygous genotype for that gene. For example, being heterozygous for hair color could mean you
have one allele for red hair and one allele for brown hair
. The relationship between the two alleles affects which traits are expressed.
How can you tell if someone is heterozygous or homozygous?
If the test cross results in any recessive offspring, then the parent organism is
heterozygous
for the allele in question. If the test cross results in only phenotypically dominant offspring, then the parent organism is homozygous dominant for the allele in question.
What is an example of homozygous?
Homozygous examples
You can have brown eyes
whether you're homozygous (two alleles for brown eyes) or heterozygous (one for brown and one for blue). This is unlike the allele for blue eyes, which is recessive. You need two identical blue eye alleles in order to have blue eyes.
