Monohybrid Inheritance
Gbogbo ọrọ náà
Why does a tall pea plant crossed with a dwarf one give all tall offspring, then dwarfs reappear in the next generation? Monohybrid inheritance is the study of how a single gene is passed on, and with one simple tool, the Punnett square, you can predict the offspring of a cross and state the exact ratios.
In this lesson you will master the language of genetics (genotype, phenotype, homozygous, heterozygous, dominant, recessive), read pedigree diagrams, and use Punnett squares to predict 3:1 and 1:1 ratios. For Extended you will work test crosses, codominance and the ABO blood groups, and sex-linked conditions such as red-green colour blindness.
Ebumnobi
- Describe inheritance as the transmission of genetic information from generation to generation
- Describe genotype as the genetic make-up of an organism and in terms of the alleles present
- Describe phenotype as the observable features of an organism
- Describe homozygous as having two identical alleles of a particular gene
- State that two identical homozygous individuals that breed together will be pure-breeding
- Describe heterozygous as having two different alleles of a particular gene
- State that a heterozygous individual will not be pure-breeding
- Describe a dominant allele as an allele that is expressed if it is present in the genotype
- Describe a recessive allele as an allele that is only expressed when there is no dominant allele of the gene present in the genotype
- Interpret pedigree diagrams for the inheritance of a given characteristic
- Use genetic diagrams to predict the results of monohybrid crosses and calculate phenotypic ratios, limited to 1 : 1 and 3 : 1 ratios
- Use Punnett squares in crosses which result in more than one genotype to work out and show the possible different genotypes
- [Supplement] Explain how to use a test cross to identify an unknown genotype
- [Supplement] Describe codominance as a situation in which both alleles in heterozygous organisms contribute to the phenotype
- [Supplement] Explain the inheritance of ABO blood groups: phenotypes are A, B, AB and O blood groups and alleles are IA, IB and Io
- [Supplement] Describe a sex-linked characteristic as a feature in which the gene responsible is located on a sex chromosome and that this makes the characteristic more common in one sex than in the other
- [Supplement] Describe red-green colour blindness as an example of sex linkage
- [Supplement] Use genetic diagrams to predict the results of monohybrid crosses involving codominance or sex linkage and calculate phenotypic ratios
Nkuzi Olu
Gee ntị na nkuzi a na ngwa
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
Mepee maapụ uche na ngwa
Kaadị ncheta
Omume ncheta ngwa ngwa n'ihe a na-anwale n'isiokwu a.
Mee omume kaadị ndị a na ngwa
Akwụkwọ Ọmụmụ
Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge
Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Monohybrid Inheritance. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- An organism with two identical alleles of a gene is described as: A. heterozygous B. homozygous C. recessive D. codominant Answer: B
- A cross between two heterozygous individuals (Bb x Bb) gives a phenotype ratio of: A. 1:1 B. 2:1 C. 3:1 D. 1:2:1 Answer: C
- A black mouse (Bb) is crossed with a brown mouse (bb). The expected phenotype ratio is: A. all black B. 3 black : 1 brown C. 1 black : 1 brown D. all brown Answer: C
- A person with blood group AB has the genotype: A. IA IO B. IB IO C. IA IB D. IO IO Answer: C
- Red-green colour blindness is more common in males because: A. the allele is dominant B. males have only one X chromosome, so a single recessive allele is expressed C. the gene is on the Y chromosome D. females cannot carry the allele Answer: B
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Mụtakwuo ihe site na isi mmalite mepere emepe
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Akụkụ akwụkwọ
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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Akụkụ akwụkwọ
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
Ndị otu ndị ọzọ bipụtara ha n'okpuru ikike mepere emepe, anyị na-ekele ha dị ka ha si chọọ. Njikọ na-emepe saịtị ha.
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Monohybrid Inheritance? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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