4. You discover a new mutant honeybee with no stripes. You...

4. You discover a new mutant honeybee with no stripes. You begin breeding this new bee with wild type striped honeybees. From your crosses you get the progeny in the table below. Using the gene symbols A for dominant and a for recessive give the possible genotypes of the parents of each cross (assume the presence/absence of stripes is controlled by a single gene). Cross Progeny solid striped A) Solid x striped 35 39 B) Solid x solid 42 0 C) Striped x striped 0 56 D) Solid x solid 67 19 E) Solid x striped 38 0

Transcript

00:01 So here according to the results which are being obtained by the crossing over or we can say the progeny which is being generated after the crosses, according to, after the crosses we can say that that allele a is dominant and it is dominant over allele small a.

00:23 It means it is recessive in nature.

00:26 So organism which has a genotype of capital a capital a or capital.

00:31 A small a, whether it is a homozygous or heterozygous dominant condition, it will code for a solid phenotype, while the genotype, that is small a, small a, will code for a stripped phenotype.

00:50 That will be coded for a stripped phenotype.

00:54 So, let's start with a.

00:57 If capital a small a small a is crossed with small a, small a, then what will happen? if they'll be crossed.

01:05 Here.

01:06 The first progeny is capital a small a.

01:09 The second progeny is capital a small a.

01:11 Third progeny is small a small a and the fourth progeny is also small a small a.

01:17 So we can say that after that that 50 % have a solid phenotype and 50 % have a stripped phenotype.

01:25 So the 50 % of spring will have a solid phenotype and that of springs are about 35 and almost 50 % will have a stripped phenotype that is around 39.

01:42 Let's talk about the second part that if capital a, capital a is crossed with capital a, capital a, capital a, so basically we can say all are dominant here.

01:53 So all the progeny which will be obtained will also be dominant.

02:00 So 100 % progeny which will be obtained will be dominant.

02:04 So here we can say that 100 % of the progeny will be solid and the number of progeny is around 42...

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