Two types of gametes are possible when following genes on the same chromosomes.
If crossing over does not occur
, the products are parental gametes. If crossing over occurs, the products are recombinant gametes. … These are the gametes that are found in the lowest frequency.
How can you tell the difference between parental and recombinant phenotypes?
Parental phenotypes
are
the phenotypes
of
the
offspring that resemble
the phenotypes
of
the
P generation.
Recombinant phenotypes
are
the phenotypes
of
the
offspring that differ from
the phenotypes
of
the
P generation.
What is the difference between parental and recombinant types?
Parental type chromosomes are the chromosomes that are similar to parental chromosomes due to the absence of crossing over between homologous chromosomes. Recombinant type chromosomes are the chromosomes that produce due to crossing over between homologous chromosomes.
What are parental gametes?
a
gamete that has a genotype identical to one of the HOMOLOGOUS CHROMOSOMES in the original diploid cell
.
What is the difference between recombinant and parental chromatids and how they arise?
Recombinant chromatids are chromosomes that have a mixture of maternal and paternal alleles instead of alleles from just a single parent. In contrast,
parental chromatids carry the same combinations of alleles that were inherited from the parents
. Crossing over has not altered them.
Do multiple alleles assort independently?
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.
What is an example of linked genes?
When a pair or set of genes are on the same chromosome, they are usually inherited together or as a single unit. For example, in
fruit flies
the genes for eye color and the genes for wing length are on the same chromosome, thus are inherited together.
How do you know if a gene is recombinant?
A recombination occurs if
there are an odd number of crossover events (usually just one) between the two loci
. An even number of crossovers (usually 0, maybe 2) would return these genes to their original chromosomal arrangement.
How do you know if a gamete is recombinant?
Two types of gametes are possible when following genes on the same chromosomes. If crossing over does not occur, the products are parental gametes.
If crossing over occurs
, the products are recombinant gametes.
What are linked genes and why do they not assort independently?
Because they are physically linked, alleles of these genes are
less likely to separate from one another during gamete formation
than are alleles of genes located on different chromosomes.
How many types of gametes will each parent?
There are
two types
of gametes will each parent produce and that is either recessive or dominant.
What is a parental type?
Parental types.
The offspring that inherits a phenotype that matches one of the parental phenotypes
. Recombinant types (recombinants) The offspring that inherits a phenotype different than that of a parental phenotype.
How do you find all possible gametes from a parental genotype?
Simply place a 2 above each heterozygous gene pair and a one above each homozygous gene pair. Then
multiply the numbers together
to obtain the total number of different possible gametes.
Which gametes can a RrYy plant produce?
A parent with RrYy genotype can produce four gametes:
RY, Ry, rY, and ry
.
Why do TT and TT genotypes have the same phenotype?
Tallness is the recessive trait for plant height
; therefore, the genotypes with Tt and TT would have the same phenotype. … Tallness is a recessive trait in pea plants. C. Tallness is the dominant trait for plant height; therefore, the genotypes with Tt and TT would have the same phenotype.
Is PP genotype or phenotype?
A simple example to illustrate genotype as distinct from phenotype is the flower colour in pea plants (see Gregor Mendel). There are three available genotypes, PP (
homozygous dominant
), Pp (heterozygous), and pp (homozygous recessive).
