ProblemAssume that long fingers are inherited as a recessive trait with 80% penetrance. Two people heterozygous for long fingers
mate. What is the probability that their first child will have long fingers?L= short fingersl= long fingersL(short) >l (long)Ll X Ll short short gametes: ½ L ½ l ½ L ½ l fertilization: ½ L ½ l ½ L ¼ LL¼ Llshort short ½ l¼ Ll¼ ll short long
The probability that their first child will have long fingers is 20%
Explanation:
<u>Available data</u>:
long fingers are inherited with 80% penetrance
L represents the dominant allele for short fingers
l represents the recessive allele for long fingers
Cross) Two people heterozygous for long fingers mate
Ll x Ll
Gametes) 1/2 L 1/2l 1/2L 1/2l
Punnet Square)
L l
L LL Ll
l Ll ll
F1) 25% or 1/4 LL
50% or 1/2 Ll
25% or 1/4 ll
Long fingers are inherited with 80% penetrance, which means that 80% is the proportion of the population that expresses the phenotype long fingers. Hence, the probability that the first child in this cross will have long fingers is:
The result of the initial rotation of the cloud of gas and dust that condensed to form the Sun and planets. As gravity condensed the clouds, of angular momentum increased the rotational speed and flattened the cloud out into a disk.
