Monohybrid Inheritance
Akopọ
Why does a calf from two hornless parents sometimes grow horns? Why can two ordinary-looking cereal plants give some drought-tolerant offspring and some that wilt in the first dry spell? The answer lies in genes, the units of inheritance passed from parent to offspring. When a single gene controls one feature, we can actually predict the offspring and the ratios in which they appear, which is exactly what a farmer who is planning a breeding programme needs to know.
In this lesson you will learn the language of inheritance: chromosomes, genes and alleles, and what it means for an allele to be dominant or recessive. You will draw genetic diagrams, or Punnett squares, to predict the results of simple crosses and work out the 1:1 and 3:1 ratios that examiners ask about. Finally you will see why the difference between an animal's genotype and its phenotype matters so much when choosing which animals and plants to breed from.
Awọn Afojusun
- (a) define the terms chromosome, gene, allele, homozygous, heterozygous, dominant and recessive.
- (b) calculate and predict the results of simple genetic crosses involving 1:1 and 3:1 ratios.
- (c) explain the meaning of the terms genotype and phenotype and assess their importance in animal and plant breeding.
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Gbọ́ ẹ̀kọ́ yìí nínú áàpù
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Akọ̀wé Ẹ̀kọ́
Àkọsílẹ̀ Ẹ̀kọ́ Pípé wà lórí Ohun Èlò Green Bridge
Gba ohun èlò Green Bridge CBT sórí fóònù tàbí kọ̀mpútà rẹ fún gbogbo ilé ìkàwé IGCSE: ìwé ìdánwò àtijọ́, ìlànà ìdíwọ̀n, àwòrán èrò, káàdì ìkẹ́kọ̀ọ́ àti ẹ̀kọ́ ohùn.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Monohybrid Inheritance. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- Which term describes an organism that has two different alleles of a gene, such as Hh? A. Homozygous B. Heterozygous C. Dominant D. Recessive Answer: B
- The allele for no horns, H, is dominant over the allele for horns, h. What is the phenotype of an animal with the genotype Hh? A. Horns B. No horns C. Half-formed horns D. It cannot be predicted Answer: B
- Two heterozygous cattle (Hh) are crossed. What is the expected ratio of offspring with no horns to those with horns? A. 1:1 B. 1:2 C. 3:1 D. 1:0 Answer: C
- Which genotype is homozygous recessive? A. HH B. Hh C. hH D. hh Answer: D
- A drought-resistant cereal (D dominant) is crossed Dd x dd. What proportion of the offspring is expected to be drought resistant? A. None B. One quarter C. One half D. All Answer: C
Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
Characteristics and Traits
Explain the relationship between genotypes and phenotypes in dominant and recessive gene systems
"Biology: Characteristics and Traits" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/12-2-characteristics-and-traits. Access for free at https://openstax.org/books/biology/pages/1-introduction
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Abala ìwé ẹ̀kọ́
Mendel’s Experiments and the Laws of Probability
Describe the scientific reasons for the success of Mendel’s experimental work
"Biology: Mendel’s Experiments and the Laws of Probability" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/12-1-mendels-experiments-and-the-laws-of-probability. Access for free at https://openstax.org/books/biology/pages/1-introduction
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Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Monohybrid Inheritance? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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