Inheritance
Muhtasari
Why do children look like their parents but never exactly the same? The answer lies in the way genes are passed from one generation to the next. Every cell in your body carries a set of instructions written in DNA, and the way those instructions combine at fertilisation determines your inherited characteristics.
In this lesson you will learn how chromosomes carry genes, how dominant and recessive alleles produce different traits, and how to use genetic diagrams and Punnett squares to predict the outcomes of crosses. You will also explore sex determination, the sources of genetic variation, and Darwin's theory of natural selection.
Malengo
- Understand that the nucleus of a cell contains chromosomes on which genes are located
- Understand how genes exist in alternative forms called alleles which give rise to differences in inherited characteristics
- Understand the meaning of the terms: dominant, recessive, homozygous, heterozygous, phenotype, and genotype
- Describe patterns of monohybrid inheritance using a genetic diagram
- Predict probabilities of outcomes from monohybrid crosses
- Understand how the sex of a person is controlled by one pair of chromosomes, XX in a female and XY in a male
- Describe the determination of the sex of offspring at fertilisation, using a genetic diagram
- Understand how random fertilisation produces genetic variation of offspring
- Understand that variation within a species can be genetic, environmental, or a combination of both
- Explain Darwin's theory of evolution by natural selection
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Kadi za kumbukumbu
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Maelezo ya Somo
Dokezo Kamili la Somo Linapatikana kwenye Programu ya Green Bridge
Pata programu ya Green Bridge CBT kwenye simu au kompyuta yako kwa maktaba kamili ya IGCSE: mitihani ya miaka iliyopita, miongozo ya usahihishaji, ramani za mawazo, kadi za marudio na masomo ya sauti.
Tathmini ya Somo
Hongera kwa kukamilisha somo la 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.
- What is an allele? A) A type of chromosome B) An alternative form of a gene C) A section of RNA D) A type of protein Answer: B
- If both parents are heterozygous (Bb), what fraction of offspring would be expected to show the recessive phenotype? A) 0 B) 1/4 C) 1/2 D) 3/4 Answer: B
- Which pair of sex chromosomes is found in a human male? A) XX B) XY C) YY D) XO Answer: B
- An organism with the genotype Bb is described as: A) Homozygous dominant B) Homozygous recessive C) Heterozygous D) Codominant Answer: C
- Which of the following is an example of environmental variation? A) Blood group B) Eye colour C) A scar from an injury D) Earlobe shape Answer: C
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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
Population Genetics
Describe the different types of variation in a population
"Biology: Population Genetics" 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/19-2-population-genetics. 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 Inheritance? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
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