GENETICS

Question 1

genetics

Answer 1

a branch of biology study the heredity and variation of organisms

Question 2

genome

Answer 2

• the genetic material of an organism
• the human genome consists of approximately 20,000 genes
• each of these genes is instruction for building a single protein

Question 3

triat

Answer 3

-any characteristic that can be passed from parent to offspring

Question 4

gene

Answer 4

• a unite of heredity that controls the development of one trait
• each chromosome carries many genes
• most genes are composed of two alleles

Question 5

alleles

Answer 5

two form of a gene ‘ one allele is dominant and the other one recessive ‘ , one allele comes from each parent represented by a single letter

Question 6

locus

Answer 6

the position in a chromosome of a particular gene or alleles

Question 7

TT or tt

Answer 7

homologous alleles

Question 8

Tt or tT

Answer 8

heterologous alleles

Question 9

The recessive allele is not expressed in the presence of the dominant allele true or false

Answer 9

true

Question 10

first generation occurs

Answer 10

self fertilization

Question 11

first generation produce

Answer 11

the self fertilization that occurs in the first one produce the second generation ,

Question 12

mendelian ratios are based on witch generation

Answer 12

mendelian ratios are based on second generation

Question 13

Punnett square

Answer 13

its a method of visualizing inheritance crosses used to help solving genetic problems

Question 14

types of genetic crosses

Answer 14

dihybrid

monohybrid

Question 15

dihybrid

Answer 15

in this cross the parent differ in two characteristic

for example , flower colour and plant height

Question 16

monohybrid

Answer 16

in this cross the parent organisms differ in a single characteristic for example , just flower colour

Question 17

genotype

Answer 17

A genotype is an organism’s set of heritable genes that can be passed down from parents to offspring. The genes take part in determining the characteristics that are observable (phenotype) in an organism, such as hair color, height, etc.

Question 18

genotypes

Answer 18

heterozygous

homozygous

Question 19

heterozygous

Answer 19

gene combination of one dominant ‘T’ with one recessive ‘t’ and called ‘ hybrid genotype ‘

Question 20

homozygous

Answer 20

gene combination of two recessives ‘tt’ or gene combination of two dominants ‘ TT’ and called pure genotype

Question 21

phenotype

Answer 21

A phenotype is an individual’s observable traits, such as height, eye color, and blood type. The genetic contribution to the phenotype is called the genotype. Some traits are largely determined by the genotype, while other traits are largely determined by environmental factors.