filmov
tv
Learn Biology: How to Draw a Punnett Square
Показать описание
A Punnett square is used to predict the chances of an offspring to have its parents' traits. These squares are most commonly divided into four parts, with each part equalling a 25% chance of the offspring receiving that set of genes. More complicated squares may have more than four parts, though the same basic method applies.
The letters surrounding and within each square represent alleles. They are one part of a gene pair occupying a specific part of a chromosome. All dominate alleles have capital letters, while the recessive ones are lowercase. Dominate alleles will always overpower recessive ones in the expression of the gene.
If the alleles for a parent do not match, they are known as heterozygous. In the image above the Gg is heterozygous. This can happen if there is a dominate and a recessive gene in the parent. If the alleles are the same for that expressed gene, it is known as homozygous. This is seen if both alleles are dominate or if both alleles are recessive; e.g., GG or gg. In order for a recessive gene to be expressed, the alleles must be homozygous.
Step 1:
---------------------------------------------------------------------
Draw the Punnett square. This is done by drawing a square, followed by a straight line up and down and another from side to side. This will quarter, or create 4 equally sized boxes within the square.
Step 2:
---------------------------------------------------------------------
Place the father's alleles on the top of the Punnett square with one letter above each box. Place the mother's alleles on the left hand side of the square, with one letter in front of each box. Be sure to use capital letters for the dominate genes and lower case letters for the recessive alleles. For this example, let's say this square represents the color of a flower. The father has one dominant blue and one recessive orange allele. The mother has two recessive orange alleles.
Step 3:
---------------------------------------------------------------------
Drop the father's alleles down into the squares and bring the mother's across. This will provide you with all possible combinations of alleles for the offspring. Each square represents a 25% chance of the offspring having that combination. If there are squares with the same cominations in them, the squares can be added together to determine the percentage.
Conclusion:
---------------------------------------------------------------------
From the completed square above, we can see that 50% of offspring will be blue since any dominant allele paired with a recessive one will win. There are, however, two homozygous combinations in which both genes are recessive, so 50% of the offspring will be orange. This means that half of the offspring will be blue, while the other half will be orange. Easy, right?
Read more by visiting our page at:
The letters surrounding and within each square represent alleles. They are one part of a gene pair occupying a specific part of a chromosome. All dominate alleles have capital letters, while the recessive ones are lowercase. Dominate alleles will always overpower recessive ones in the expression of the gene.
If the alleles for a parent do not match, they are known as heterozygous. In the image above the Gg is heterozygous. This can happen if there is a dominate and a recessive gene in the parent. If the alleles are the same for that expressed gene, it is known as homozygous. This is seen if both alleles are dominate or if both alleles are recessive; e.g., GG or gg. In order for a recessive gene to be expressed, the alleles must be homozygous.
Step 1:
---------------------------------------------------------------------
Draw the Punnett square. This is done by drawing a square, followed by a straight line up and down and another from side to side. This will quarter, or create 4 equally sized boxes within the square.
Step 2:
---------------------------------------------------------------------
Place the father's alleles on the top of the Punnett square with one letter above each box. Place the mother's alleles on the left hand side of the square, with one letter in front of each box. Be sure to use capital letters for the dominate genes and lower case letters for the recessive alleles. For this example, let's say this square represents the color of a flower. The father has one dominant blue and one recessive orange allele. The mother has two recessive orange alleles.
Step 3:
---------------------------------------------------------------------
Drop the father's alleles down into the squares and bring the mother's across. This will provide you with all possible combinations of alleles for the offspring. Each square represents a 25% chance of the offspring having that combination. If there are squares with the same cominations in them, the squares can be added together to determine the percentage.
Conclusion:
---------------------------------------------------------------------
From the completed square above, we can see that 50% of offspring will be blue since any dominant allele paired with a recessive one will win. There are, however, two homozygous combinations in which both genes are recessive, so 50% of the offspring will be orange. This means that half of the offspring will be blue, while the other half will be orange. Easy, right?
Read more by visiting our page at:
0:03:23
How to Draw Female Reproductive System (2D) | Biology Diagrams | Easy and Stepwise Guide | Class 12
0:00:29
Female reproductive system easy steps #femalereproductivesystem #biology #reproductivesystem #female
0:00:06
How to study Biology? 🧬 🧪
0:00:15
Microscope Drawing #microscopedrawing #shorts #biology
0:02:02
5 number turns into Human Heart Diagram drawing class 10 science biology
0:00:16
HowToDraw Human Lungs/ 🫁/biology drawing|respiration system easyart|4 Dots
0:04:14
How to draw #nephron diagram in easy steps |10th | Biology |Science | CBSE syllabus | NCERT class 10
0:21:45
Most important diagrams class10 biology you must practice | class10 biology all important diagrams
0:09:29
Labelled Diagram of Nephron l How to Draw Nephron with Labelling l Nephron l ES art & craft
0:00:50
Learn Biology With Fun | Let's Draw it | Vedantu
0:00:55
Human heart diagram drawing class 10 Science #cbse #class10 #biology #ncert
0:08:00
Easy way to draw human #heart :Life processes | NCERT class 10 | biology | science| CBSE syllabus
0:00:17
how to draw human digestive system diagram #shorts #youtubeshorts #biology #kapil #art #drawing
0:01:00
How to draw Female Reproductive System in easy steps #shorts #femalereproductivesystem #biology
0:21:13
Most Important Diagrams You Must Practice Class10 Biology
0:02:32
How to Draw Structure of Neuron | Biology Diagram Class 10 #structureofneuron #easydraw #howtodraw
0:00:13
DNA drawing trick 🤩❤️ | NEET Motivation 📚 | Biology Drawing 🤑 #shorts #viral #drawing #motivation...
0:00:45
How to draw Human Respiratory system | Draw Lungs | Ncert | Biology | Easy | Step by step | Diagram
0:17:01
BIOLOGY CELL STRUCTURE
0:00:22
how to draw mitochondria | biology drawing | pencil art #artanddrawing #biologydiagram #viralshorts
0:00:56
How to draw Animal cell step by step || Biology diagram || Animal cell diagram#shorts
0:05:54
Microscope Drawings - Biology A-level
0:00:16
BIOLOGY PRACTICALS 🪳🔬🦠🧪 #biology #experiment #like #practical #science #share #subscribe
0:00:35
Real female reproductive system #biology #shortvideo #shorts #short
Комментарии