Category: Genetics

Genetics Quiz

How many chromosomes are present in male and female grasshopper? A ns: The numbers of chromosomes in male are 23. It has I I pairs and one X chromosome. So it is XO. The female has 24 chromosomes. It has 12 pairs of autosomes and one pair of sex chromosome XX. What is difference between [Continue]

Sex Limited Trait

The traits limited to only one sex due to anatomical differences are called a sex limited treat. Such trait affects a structure or function of the body of males or females only. These traits are controlled by sex-linked or autosomal genes. For example: (i).       Genes for milk production in dairy cattle affect only cows. (ii).      [Continue]

Sex Determination

XY – MECHANISM This pattern of sex determim tion is round in Drosophila, man and many other organisms. (a) Male: Male is XY. Mite is heterogametic. It produces two types of sex-determining sperms. Half the sperms carry X-chromosome and the other half carry Y — chromosome. Chances for both types of sperms are equal. ) [Continue]

Sex linkage

Sex Linkage in Man  Colour Blindness Color blindness, or color vision deficiency, in humans is the inability to differentiate between som or all colors that other people can distinguish. It is most often of szr.etie nature. But it may also occur because of eye, nerve, or brain da. ,age, or due to exposure to certain [Continue]

sex linked inheritance example

Sex Linkage in Drosophila Thomas Hunt Morgan (1910) discovered sex linkage in fruit fly Drosophila. It supported the chromosomal theory of heredity. Morgan deveioped cultures of Drosophila flies. He studied different traits like mour of the eye. Normal fruit flies or wild type have bright red eyts One of his coworkers Calvin Bridges discovered a [Continue]

Genetics Quiz Questions And Answers

Multiple Choice Questions (MCQs) and Fill In the blanks Experiments on Plant Hybridization was written by: (a) Sutten          (b) Mendel    (c) Darwin     (d) De Varies Word gene was used by: (a) Sutten      (b) Mendel    (c) Bateson    (d) De Varies The cross in which two characters are followed at the same time is called: (a) Monhybrid [Continue]

genetics practice problems

genetics practice problems  What is Clinical genetics? Ans:     It includes the training of genetists to diagnose, treat, and counsel patients with genetic disorders or syndromes. Who did rediscovred Mendel’s work? Ans: re-discovered” by three European scientists, Hugo de Vries, Carl Correns, and Erich von Tschermak. What was the contribution of Thomas Hunt Morgan in genetics? [Continue]

Sex linked Inheritance

Sex linked Inheritance   The inheritance of a trait (phenotype) that is determined by a gene located on one of the sex chromosomes is called sex linked inheritance. The expectations of sex-linked inheritance in any species depend on how the chromosomes determine sex. For example, in humans, males are heterogametic. It has one X chromosome [Continue]

Mendel’s Law Of Independent Assortment

LAW OF INDEPENDENT ASSORTMENT It states that, when two contrasting pairs of trait are followed in the same cross, their alleles assort independently into the two gametes and the distribution of alleles of one trait into gametes has no influence on the distribution of alleles of the other trait. Alleles of one pair inherit independently [Continue]

Mendelian Genetics

          Mendelian Genetics Chapter 10 section 2 mendelian genetics Introduction of Mendel Gregor Joha Mendel was borne in 1822. He died in 1884. He was a priest. He formulated two laws of heredity: (a)   Law of segregation (b)   Law of independent assortment. Mendel presented his findings to Brunn Society for the [Continue]