3) A researcher studied five independently assorting genes in a plant. Each gene

Question

3) A researcher studied five independently assorting genes in a plant. Each gene has a dominant and a recessive allele: R black stem, r red stem; D tall plant, d dwarf plant; C full pods, c constricted pods O round fruit, o oval fruit; H hairless leaves and h hairy leaves. Consider the following cross: a) How gamete types can be formed by the parent plant on the left (Rr Dd cc Oo Hh)? b) How gamete types can be formed by the parent plant on the right (Rr dd Cc oo Hh)? c) If you were to write out a punnett square (DON'T!) how many squares would it consist of? d) How many genotypes are possible among the progeny of this cross? e) How many phenotypes are possible among the progeny? f) What is the probability of obtaining the Rr Dd cc Oo hh genotype in the progeny? g) What is the probability of obtaining a black, dwarf, constricted, oval and hairy phenotype in the progeny?

Explanation / Answer

Rr Dd cc Oo Hh X Rr dd Cc oo Hh

a. Gametes Rr dd Cc oo Hh: 8 Gametes

RdCoH, RdCoh, RdcoH, Rdcoh, rdCoH, rdCoh, rdcoH, rdcoh

b. Gametes Rr Dd cc Oo Hh 16 gametes

RDcOH, RDcOh, RDcoH, RDcoh, RdcOH, RdcoH, RdcOh, Rdcoh, rDcOH, rDcOh, rDcoH, rDcoh, rdcOH, rdcoH, rdcOh, rdcoh

c. Punett square would consists of 128 squares

d. types of genotypes are possible as

Rr X Rr = 3 genotypes

Dd X dd = 2 genotypes

Cc X CC =2 genotypes

Oo X oo=2 genotypes

Hh X Hh = 3 genotypes

Total genotypes 3 *2*2*2*3= 72 types of genotypes

e. 16 types of phenotypes are possible as RDcOH, RDcOh, RDcoH, RDcoh, RdcOH, RdcoH, RdcOh, Rdcoh, rDcOH, rDcOh, rDcoH, rDcoh, rdcOH, rdcoH, rdcOh, rdcoh

f. Rr Dd cc Oo Hh = ½* ½* ½*1/2*1/2= 1/32

g. 3/128 is probability

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