The innate tendency of offspring to resemble their parents is called?
The innate tendency of offspring to resemble their parents is called heredity. The offspring resembles to parent due to same genetic combination inherited from parents.
Monohybrid ratio is _________.
Who is regarded as the father of genetics?
Gregor Mendel is known as the Father of Genetics. He experimented on pea plants and discovered the basic inheritance rules.
Material used for conducting experiments on genetic traits by Mendel was _________.
The physical expression or appearance of a character is called as:
F2 generation is obtained by _________.
In monohybrid and dihybrid cross F2 generation is obtained by selfing of F1 hybrids as male and female.
Dihybrid cross proves the law of _________.
In pea plants, yellow seeds are dominant to green, If a heterozygous yellow seeded plant is crossed with a green seeded plants, what ratio of yellow and green seeded plants would you expect in F1 generation?
In a cross between a pure tall plant with green pod and a pure short plant with yellow pod. How many short plants are produced in F2 generation out of 16?
Genotype of pure tall plant with green pod = TTGG
Genotype of pure dwarf plant with yellow pod = ttgg
P generation: TTGG X ttgg
F1 generation:TtGg(tall plant, green pod)
Selfing: TtGg X TtGg
As can be seen from the table total 4 short plants with genotypes ttGG, ttGg, ttGg and ttgg are produced.
The test cross is used to determine the ________.
In a test cross:
The genotypes of a husband and wife are IA IB and IAi. Among the blood types of their children how many different genotypes and phenotypes are possible?
A cross between two individuals, one with AB blood group and the other with A blood group will produce four genotypes and three phenotypes.
The genotype of a husband and wife are IAIB and IAi.
Four different possible genotypes of their children are: IAIB, IAi, IBi, IAIA
The possible number of phenotypes of their children are:
Inheritance of skin colour in human being is an example of _______.
So, the correct option is 'B' ‘ Polygentc/Quantitative inheritance.
Which of the following is an example of co-dominance?
Co-dominance is the phenomenon that deviates from Mendel’s law of inheritance. Both the alleles appear in offspring instead of one as in Mendel’s experiment. ABO blood grouping in human being is example of co-dominance in which both IA and IB appear simultaneously to form AB blood type.
For ABO system of blood groups, allele IA produces N-acetylgalactosamine transferase enzyme which recognises H- antigen present in RBC membrane and adds N-acetylgalactosamine to sugar parts of H antigens to form A antigen.
The allele IB produces galactosyl transferase enzyme which recognized H antigen to form B antigens. Allele i does not produce any sugar or antigen.
IA and IB are completely dominant over i, in other words antigens A and B are produced. This is because of co-dominance. These antigens determine the type of blood group. Blood group A has antigens B have antigen, AB has both antigens while blood group. Blood group A have antigen A, group B have antigen B, AB has both antigens while blood group O do not carry any antigens.
Thus, six genotypes and four phenotypes are possible.
A human male produces sperms with the genotypes AB, Ab, aB, ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?
If the genotype is AaBb the alleles that will be produced will be AB, Ab, aB, ab, since there are two diallelic characters in the genotypes the person must be heterozygous for both genes. AABB is homozygous. So, the correct answer is "AaBb".
In Mirabilis jalapa, when two F1 pink flowered plants were crossed with each other, the F2 generation produced 40 red, 80 pink and 40 white flowering plants. This a case of:
F1 pink flowered plants are heterozygous. When selfing is done the genotype and phenotype develops as 1:2:1 as 40 red, 80 pink and 40 white flowering plants.
Assertion: The cross between red and white flower-bearing snapdragon plants results in pink coloured flower.
Reason: Incomplete dominance of red and white flower results in pink coloured flower.
Crossing over brings:
Plotting of specific genes on the chromosome is known as _________.
When two genes are situated very close to one another on a chromosome _________.
XY chromosome that determine the sex in human beings are:
Sex chromosomes of human beings are heteromorphic as they are of different size. Y chromosome is smaller than X chromosome in size.
Statement I: The bridge between one generation and the next is sperm and ovum.
Statement II: Both sperm and ovum contribute equally to heredity.
Statement III: Somatic diploid cells possess two chromosomes as well as two mendelian factors of each type.
Hence , the correct answer is option B.
Sex determination in human beings is _________.
XO type of sex determination is found in _________.
In grasshopper, sex determination is of XO type, in which the males have only one X-chromosome besides the autosomes whereas females have a pair of X-chromosomes.
In human beings, if ovum fertilizes with a sperm carrying X-chromosome, the zygote develops into _________.
Male produce two kinds of sperms, half carrying X and half carrying Y sex chromosome besides 22 autosomes. If ovum is fertilized by sperm carrying X chromosome the sex of child developed is female.
Henking X-body present in 50% of sperms are now known as:
Henking trace a specific structure in 50% of sperms. He gave the name x-body to this structure but he was not able to explain the significance of this structure. Further, investigation revealed that x-body was a chromosome, called X-chromosome.