NEKEMTE EVENING TUTORIAL CLASS(NETC)

1. In the Caucasian population of the US, 1 in 2500 babies is affected by a recessive condition – cystic fibrosis. In this population, the frequency of the dominant allele is (a) 0.02 (b) 0.36 (c) 0.56 (d) 0.98 Answer: (d) 2. A sampled “a” population has 36% of homozygous recessive genotype (aa). Then the frequency of allele “a” is (a) 0% (b) 20% (c) 60% (d) 70% Answer: (c) Explore: NEET 2022 Answer Key With Solutions 3. 360 out of 1000 individuals in a population have a genotype of AA while 480 have Aa genotype. The rest 160 belong to aa. Frequency of allele A in this population is (a) 0.7 (b) 0.6 (c) 0.5 (d) 0.4 Answer: (b) 4. A gene locus has two alleles A and a. If the frequency of dominant allele A is 0.4, then the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population is (a) 0.16(AA); 0.48(Aa); 0.36(aa) (b) 0.16(AA); 0.24(Aa); 0.36(aa) (c) 0.16(AA); 0.36(Aa); 0.48(aa) (d) 0.36(AA); 0.48(Aa); 0.16(aa) Answer: (a) 5. What does p2 in the below mentioned Hardy-Weinberg equation indicate? (p+q)2 = p2 + 2pq + q2 (a) individuals that are heterozygous dominant (b) individuals having a lethal allele (c) individuals that are homozygous dominant (d) individuals that are homozygous recessive Answer: (c) 6. 25 individuals in a population are homozygous dominant, then the individuals that are expected to be homozygous recessive are (a) 100 (b) 75 (c) 50 (d) 25 Answer: (d) 7. Consider a population of sheep to be in Hardy-Weinberg equilibrium. The allele for black wool(w) has an allele frequency of 0.81 while the allele for white wool(W) has an allele frequency of 0.19. Then the percentage of heterozygous individuals in the population is (a) 4% (b) 15% (c) 31% (d) 66% Answer: (c) 8. This condition is essential for a population to be in the Hardy-Weinberg equilibrium (a) random mating (b) no mutations (c) large population (d) all of these Answer: (d) 9. This statement describes the Hardy-Weinberg law the best (a) it is impossible to predict expected allele frequencies mathematically (b) in large populations, dominant alleles become more prevalent (c) allele frequency changes over a period of time in a large population (d) mechanism of inheritance in a large population does not change allele frequency Answer: (d) 10. This is true of the population which are included in Hardy-Weinberg equilibrium (a) entities migrate constantly (b) populations should be limited and small (c) mating is random (d) process of natural selection is occurring Answer: (c) 11. Hardy-Weinberg equilibrium operates in the absence of (a) Gene flow (b) Mutation (c) Natural selection (d) All of these Answer: (d)

Biology Grade 12 full shortnotes

grade 11 bio

Important Facts About Human Body  🔸 Normal Sperm Count: ➖ 250-400 million/ejaculation 🔸 Menstrual cycle: ➖ 28 days 🔸 Menopause age: ➖ 45-50 years 🔸 Blood clotting time: ➖ 3-5 minutes 🔸 Weight of Brain: ➖ 1300-1400 gm in human adult 🔸 Normal Blood Pressure (B.P.): ➖ 120/80 mm Hg 🔸 Average body weight: ➖ 70 kg 🔸 Normal body temperature: ➖ 37 degree celsius 🔸 Breathing Rate at rest: ➖ 12-16/minute 🔸 Number of Spinal Nerves: ➖ 31 pairs 🔸 Largest Endocrine Gland: ➖ Thyroid gland 🔸 Gestation period: ➖ 40 weeks or 9 calendar months 🔸 Normal Heart Beat at rest: ➖ 72 beats per minute 🔸 Largest Gland: ➖ Liver 🔸 Largest Muscle in the body: ➖ Gluteus Maximus or Buttock Muscle 🔸 Smallest Muscle in the body: ➖ Stapedius 🔸 Largest Artery: ➖ Aorta 🔸 Largest Vein: ➖ Inferior Vena Cava 🔸 Largest and longest Nerve: ➖ Sciatic Nerve 🔸 Longest Cell: ➖ Neurons (nerve cells) 🔸 Minimum distance for proper vision: ➖ 25 🔸 Largest and strongest Bone in the body: ➖ Femur (thigh bone) 🔸 Smallest Bone in the body ➖ Stapes in ear 🔸 Number of Cells in the body ➖ 75 trillion 🔸 Volume of Blood in the body ➖ 6 litres (in 70 kg body) 🔸 Number of Red Blood Cells(R.B.C.) ➖ In male: 5 to 6 million/cubic mm ➖ In female: 4 to 5 million/cubic mm 🔸 Life span of Red Blood Cells(R.B.C.) ➖ 100 to 120 days 🔸 Life span of White Blood Cell(W.B.C.) ➖ 3-4 days 🔸 Normal White Blood Cell(W.B.C.) count ➖ 5000-10000/cubic mm 🔸 Time taken by R.B.C. to complete one cycle of circulation: ➖ 20 seconds 🔸 Other name of Red Blood Cell (R.B.C.): ➖ Erythrocytes 🔸 Largest White Blood Cells: ➖ Monocytes 🔸 Smallest White Blood Cells: ➖ Lymphocyte 🔸 Who discovered Blood Group: ➖ Karl Landsteiner 🔸 Blood Platelets count: ➖ 150,000 - 400,000 platelets per micro litre 🔸 Haemoglobin (Hb): ➖ In male: 14-15 gm/100 c.c. of blood ➖ In female: 11-14 gm/100 c.c. of blood 🔸 Hb content in body: ➖ 500-700 gm 🔸 pH of Urine: ➖ 6.5-8 🔸 pH of Blood: ➖ 7.36-7.41 🔸 Volume of Semen: ➖ 2-5 ml/ejaculation 🔸 Pulse rate: ➖ 72 per minute 🔸 Thinnest Skin: ➖ Eyelids 🔸 Weight of Heart: ➖ 200-300 gm