Biology Punnet Squares? ! Help!
[From: ] [author: ] [Date: 12-04-04] [Hit: ]
her genotype is XX. The male is color blind so he must have the recessive allele so his genotype is XY. ____X___XX__XX__XXY__XY__XYSince males are XY there is a 50% chance of having a color blind son (1/2).-1. 100% Aa; 100% attached2. 25% AA attached,......
_____A______O
A ___AA_____AO
B____AB____BO
10. The mother is a carrier that must mean she has the recessive trait on one of her X chromosomes we will denote this as X', thus, her genotype is XX'. The male is color blind so he must have the recessive allele so his genotype is X'Y.
____X___X'
X'__XX'__X'X'
Y__XY__X'Y
Since males are XY there is a 50% chance of having a color blind son (1/2).
-
1. 100% Aa; 100% attached
2. 25% AA attached, 25% aa free, 50% Aa attached
3. 100% Bb
4. 50% Tall, 50% short
5. 50% Rr pink, 50% rr white
6. 25% RR red, 25% rr white, 50% Rr pink
7. 50% heterozygous for A blood, 50% heterozygous for B blood
8. 50% AB, 50% heterozygous for B blood
9. 50% AB blood, 50% B blood
10. 25% chance of a colorblind male
-
Read your Biology book and ask a teacher or classmate.
-
If you don't know any of this, you are so totally screwed. Even giving you the answer to each won't be enough for you to pass.
I will give you a bit of a lesson to get you started. We get a set of DNA from each parent and for traits that have one gene code and show complete dominance, we can predict the possible and probable outcomes easily.
We use letters to label genes so we can keep track easier. A capital letter usually denotes a dominant gene and a lowercase letter denoted a recessive gene.
Drawing a small table called a Punnett square, helps us to better see and more easily calculate probabilities.
It isn't hard, google it or crack your textbook, and good luck.
