18-24pls he _ designates any of the generations following the parental generatio
ID: 262591 • Letter: 1
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18-24pls
he _ designates any of the generations following the parental generation, P B) filial C) fraternal 18) We use this cross when there are two traits involved (Rryy x Rryy) A) Monohybrid B) Dihybrid 8) 46 20 When a trait is expressed to a different degree among people with the same genotype, it is called AjStatic espressivity B) Incomplete penetrance C) Variable expressivity DiDominance 21) Select incorrect statement A)The human genome is 3M base pairs in length 8We have about 20,000 coding genes C) 98% of our DNA codes for genes D)nk" DNA makes up the majority of our DNA 22-Most vioient crime is linked with which gene? AIEDAR B?MYH 16 C) SRY D) IGF 23) inheritance in which the trait is produced from the cumulative effects of many genes A) Peotropic B) incomplete penetrance C) Variable expressivity D)Polygenic 24) nmethylated agouti gene has been seen to lead to A) Yellow, obese mice B) Thin brown miceExplanation / Answer
18. It is dihydrid cross as there are two genes involved. The R gene has two alleles R and r and the Y gene has two alleles Y and y.
Right option is B. Dihybrid
19. A pair of chromosomes that pairs during meiosis are known as homologous chromosome. Human has 23 homologous chromosomes: 22 are autosomes and one is sex chromosomes.
Right options is A. 23
20. Incomplete penetrance is expression of different degree of phenotype in among individuals that have the same genotype.
Right option is B. Incomplete penetrance
21. More than 75% of human DNA does not code for any functional proteins. This DNA include non coding sequences, introns. Only 1-2% DNA codes for functional proteins.
Right option is C. 98% of our DNA codes for genes.
22. SRY gene is linked to violent crime. More than 95% of violent crime offenders are males that have SRY gene. Around 5% are women that lack SRY.SRY has been linked to aggressive behavior in men.
Right option is C. SRY
23. Polygenic traits are traits that are expressed by activity of many genes. Skin color in human is a polygenic trait due to atleast three genes.
Right option is D. Polygenic
24. The agouti gene is subject to methylation. When it is methylated, coat color is brown and the mice are thin. However, when it is unmethylated, the coat color is yellow and mice are obese and prone to diabetes and cancer.
Right option is A. Yellow obese mice
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