21. (6 pts) A white female mouse is crossed to a black male mouse. The resulting F1 progeny segregate 1/2 black and 1/2

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21 6 Pts A White Female Mouse Is Crossed To A Black Male Mouse The Resulting F1 Progeny Segregate 1 2 Black And 1 2 1 (37.3 KiB) Viewed 45 times

21. (6 pts) A white female mouse is crossed to a black male mouse. The resulting F1 progeny segregate 1/2 black and 1/2 white mice (no differences between sexes). The white progeny from this cross are mated to produce an F2 family (white x white). If all of the progeny in this F2 family are white, A) which allele is dominant (black or white) and B) what is the genotype of the original parents? Use the words "black" and "white" to refer to these alleles. A). B) Female Male 23 (4 pts) Identical twins more often share certain behavioral disorders (e.g. autism) than non-identical twins. However, in almost all cases, the frequency with which identical twins share the disorder is not 100%; in some cases, one member of a twin pair will have the disorder and the other will not. What is the explanation for this? Answer in no more than two sentences.