Heredity And Mendel's First Law
Gbogbo ọrọ náà
Why does a black bull crossed with a black cow sometimes throw a red calf. Why do two hornless goats occasionally produce a horned kid. The answer is not chance: it is heredity, the orderly passing of traits from parent to offspring, and it follows rules precise enough to predict on paper before a single mating takes place.
In this lesson you will learn the vocabulary breeders and examiners share: gene, allele, dominant, recessive, genotype and phenotype. You will then meet Mendel's first law, the law of segregation, and use it to solve monohybrid cross problems on real farm traits, coat colour and the polled condition, working out exactly what a planned mating is likely to produce.
Ebumnobi
- Define heredity
- State Mendel's first law of inheritance
- Explain the terms gene, allele, dominant and recessive
- Solve a simple monohybrid cross problem using Mendel's first law
- Explain the application of Mendel's first law to animal breeding
Akọmọ Ojú-ẹkọ
Yi rajista ka ci gaba
Kpọpụta akaụntụ n’efu ka ị nweta ohere na ihe ọmụmụ niile, ajụjụ omume, ma soro mmepe gị.
Ayẹwo Ẹkọ
Ekele diri gi maka imecha ihe karịrị na Heredity And Mendel's First Law. 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.
- In cattle, black coat colour (B) is dominant over red coat colour (b). What is the phenotype of an animal with genotype Bb? A. Red B. Black C. A mixture of red and black D. Cannot be determined Answer: B
- The actual pair of alleles an animal carries for a gene is called its: A. Phenotype B. Genotype C. Allele D. Chromosome Answer: B
- Mendel's first law states that: A. Genes for different traits assort independently B. The two alleles of a gene separate during gamete formation C. Dominant alleles always outnumber recessive alleles D. Offspring always resemble one parent exactly Answer: B
- Two heterozygous polled goats (Pp) are mated. What phenotype ratio is expected among the offspring? A. 1 polled : 1 horned B. 1 polled : 3 horned C. 3 polled : 1 horned D. All polled Answer: C
- An animal carrying two identical alleles for a gene, such as BB, is described as: A. Heterozygous B. Homozygous C. Recessive D. Hybrid Answer: B
Yi rajista ka ci gaba
Kpọpụta akaụntụ n’efu ka ị nweta ohere na ihe ọmụmụ niile, ajụjụ omume, ma soro mmepe gị.
Yi rajista ka ci gaba
Kpọpụta akaụntụ n’efu ka ị nweta ohere na ihe ọmụmụ niile, ajụjụ omume, ma soro mmepe gị.
