Monohybrid Inheritance
Muhtasari
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.
Malengo
- 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
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Tathmini ya Somo
Hongera kwa kukamilisha somo la Monohybrid Inheritance. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- 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
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Vitabu Vinavyopendekezwa
Jifunze zaidi kutoka vyanzo huria
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Sehemu ya kitabu
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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Sehemu ya kitabu
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
Vimechapishwa na mashirika mengine chini ya leseni huria na vinatajwa kama wanavyoomba. Viungo hufungua tovuti zao.
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Monohybrid Inheritance? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
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