Question

GENETICS LAB REPORT Set up and complete a Punnett's square to combine the sperm with the eggs (gametes), to determine the possible combinations for their children (F1 generation) concerning the finger length gene. 2 Le Le Le Le What is the expected genotypic ratio of the offspring from this cross? LL: Llibeill 1:2:1 If this couple had many children, what percentage of their children would you expect to have longer fingers? I have long fires So percentage is 75010 CLL, Le, ce) What percentage would you expect to have short fingers? One in Flenection So aso1 Ceci Despite the fact that there are laws preventing the marriage of a brother and a sister, two of these F kids decide to have children of their own to produce the Fz generation. (This is just a story!). Using the key from the previous question, what are the gametes produced by the male F, and his fi sister? Fi Sister: XXIS - Two cametes Flil F, brother. XYIS 2 X 122

Answer 1

GAMETE       MALE       Female	L	l
L	LL (longer Fingers)	Ll (longer Fingers)
l	Ll (longer Fingers)	ll (Shorter Fingers)

Ans: As described in the question the genotype we are getting after the F1 cross is Ll for both male and female as the gametes for finger gene is recessive in case of female and dominant in case of male. So after crossing the F1 hybrid we get the following Punnett’s square:

So the predicted genotype ratio is 1:2:1 (homozygous dominant: heterozygous dominant: homozygous recessive).

From the data we produced we can say that 25% would have short fingers.

From the data we can expect that 75% would have longer fingers