INHERITANCE OF ONE GENE Flashcards
(30 cards)
The first hybrid generation is also called ________/_______
Filial progeny, F1
All the F1 progeny plants were __________
height = char.
Tall
Mendel found that the F1 always resembled ______________
either one of the parents
In the F2 generation, some of the offspring were __________
height = char.
dwarf
Dwarf plants proportion was ________ while proportion of tall plants’ proportion was _________
1/4th of the F2 plants , 3/4th of the F2 plants
The tall and dwarf traits were identical to their parental type and did not show any blending
True/false
True
All the offspring were either tall or dwarf, none were of in-between height
True/false
True
Mendel proposed that something was being stably passed down unchanged, from parent to offspring through the gametes, over successive generations and he called these _________
factors
Now, factors are called _________
genes
Function of genes?
They contain the information that is required to express a particular trait in an organism
Genes which code for a pair of contrasting traits are known as ________
alleles
Alleles are ________
slightly different forms of the same gene
The capital letter is used for the trait expressed at the ____
F1 stage
In a true breeding tall or dwarf plant, allelic pair of genes for height are identical or _________
homozygous
TT and tt are called the ________
genotype of the plant
Descriptive terms tall and dwarf are ________
the phenotype
In a pair of dissimilar factors, one dominates the other and hence is called ____ while the other factor is called _______
dominant, recessive
Tt plant is heterozygous for ________ and hence it is a monohybrid
genes controlling one chaaracter
The cross between TT and Tt is a __________
monohybrid cross
When the tall and dwarf plant produce gametes by the process of meiosis, the alleles of the parental pair separate or segregate from each other and only one allele is transmitted to a gamete. This is concluded from which observation?
Recessive parental trait is expressed without any blending in the F2 generation
The segregation of alleles is a random process and so there is 25% chance of a gamete containing either allele
True/false
False
50 %
Which diagram explains production of gametes by the parents, the formation of the zygotes ?
Punnett Square
Punnett Square wass developed by _________
a British geneticist, Reginald C.Punnett
What is the test cross? Why is test cross performed?
Tt x tt; To determine the genotype of a tall plant at F2
