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Identify the different traits in genetics and determine whether they are controlled by recessive or dominant alleles

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Identify the different traits in genetics and determine whether they are controlled by recessive or dominant alleles Introduction Any measurable characteristic or distinctive trait passed by an organism is called phenotype of that organism. It may be visible to the eye, such as the colour of the flower or the texture of the hairs, or it may require special tests for its identification, as in the determination of the respiratory quotient or the serological test for blood type Mendel in his monohybrid cross between a homozygous tall and homozygous dwarf pea plants found in the first filial generation (F1) the heterozygote individuals, with the character of only one parent i.e. tall. When self-fertilized, F1 produced the second filial generation (F2) tall and dwarf individuals in the ratio of 3:1 Such a phenotypic trait or character which appears only in the homozygous individual is called a recessive trait and the pair of alleles which specify a recessive phenotypic trait (i.e. ...read more.


pig Coat color Black White 10 Salamander Body color Dark Light 11 Land snail Shape of shell Unbanded Banded 12 Drosophila Eye color Red White Wings Long wings Vestigial wings Body color Grey Black 13 Cat Skin color Tabby Black or blue Hair length Short hairs Long (Angora) hairs 14 Dog Skin color Grey Black Tail Stumpy Normal tail 15 Cattle Color of face White Colored Horn Polled or hornless Horned 16 Horse Skin color Black Red Movement Trotting Pacing 17 Sheep Hair, wool or fleece White Black 18 Swine or pig Skin color Black Red Hoof Uncleft Cleft (normal) 19 Pea Stem length or height Standard Dwarf Seed shape Round Wrinkle Seed color Yellow Green Flower color Purple White Pod shape Inflated Constricted Pod color Green Yellow Flower and pod position Axial (along stem) Terminal (at top of stem) 20 Humans Human cont. Human cont. Human cont. Skin Normal (pigmented) skin Albino or non-pigmented skin Scaly skin (ichthyosis) Normal Black skin (polygenic, incompletely dominant) White skin Epidermis bullosa (sensitive to slight abrasion) ...read more.


nosetrils Narrow nosetrils High narrow bridge of nose Low broad bridge Roman nose Straight nose Hair Dark hair Blond Non-red hair Red hair Curl hair Straight hair Abundant body hair Little body hair Hairlessness (congenital hypotrichosie) Normal Early baldness (dominant in male only) Normal Pie bald (skin and hair spotted with white) Self-color White forelock Self-color Skeleton and Muscle systems Achondroplasia (dwarfism) Normal Polydactylly Normal Syndactyly (webbing of two or more fingers or toes) Normal Brachydactyly (short digits) Normal fingers Short stature (polygenic) Tall stature Cartilaginous growth of bones Normal Progressive muscle atrophy Normal Hare lips and cleft palate Normal Nervous system Huntington's disease Normal Tasters of phenylthiocarbamide Non-tasters Normal Congenital deafness Sick headache Normal Normal Phenylketonuria Normal Schizophrenia Paralysis agitans Normal Reference: 1. P.S. Verma, V. k. Agarwal (2004): Genetics. Himalaya publishers 2. M.B.V. Roberts (1993): Biology: A functional Approach 4th edition 3. Neil A. Campbell (1993): Biology. 3rd edition Benjamin/Cumming publishing company 4. Daniel L. Hartl, Elizabeth W. Jones (1998): Genetics: Principles and analysis. 4th edition, Jones and Bartlett publishers, INC. ...read more.

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