Chapter 16 Heredity and Variation
- Explain tha disorders -Abinism Answer: Albinism is a hereditary (genetic) disorder in which the body cannot produce the pigment melanin, so the skin, hair and eyes lack no... 1
- Slim person feel more cold in winter the fat persons. Answer: Fat persons have a thicker layer of fat (adipose tissue) under the skin, which acts as an insulator and reduces heat loss. Slim pers... 1
- Why it is necessary for people to have their blood examined before their marriage? It is necessary for people to have their blood examined before their marriage because genetic disorders are mainly transmitted through the r... 2
- Explain the structure, function and types of RNA. Answer: RNA (ribonucleic acid) is usually a single-stranded nucleic acid made of ribonucleotides; its main job is protein synthesis. Its thr... 1
- Explain your opinion about the DNA fingerprinting. DNA fingerprinting is the technique in which the sequence of the genes in the DNA of a person, i.e., the genome of the person is identified.... 1
- Describe the structure of DNA molecule. Answer: DNA is a double helix made of two long strands of nucleotides, twisted around each other like a spiral ladder (Watson and Crick mode... 1
- What is mean by chromosome? Explain its types. The structure in the nucleus of cells which carries hereditary characteristics is called as chromosome which is mainly made up of nucleic ac... 1
- Is it right to avoid living with a person suffering from a genetic disorder? No, it is not right to avoid living with a person suffering from a genetic disorder. Genetic disorders are transmitted from parents to offsp... 1
- Distinguish between monohybrid and dihybrid cross. Monohybrid cross Dihybrid cross (i) Cross involving a single pair of contrasting characters is called monohybrid cross. (i) Cross involving... 1
- Explain Mendel’s dihybrid ratio with any one of the cross. Answer: In a dihybrid cross, the F2 generation shows the phenotypic ratio 9 : 3 : 3 : 1. A dihybrid cross studies two pairs of contrasting c... 1
- a) Explain Mendel’s monohybrid progeny with the help of any one cross. Answer: In a monohybrid cross between pure tall (TT) and pure dwarf (tt) pea plants, all F1 plants are tall, and the F2 generation shows tal... 1
- Complete the following sentences by choosing the appropriate words from the brackets. a) Hereditary characters are transferred from parents to offspring’s by gene hence they are said to be structural and functional units of he... 1